Sources:

Online databases with Information on the Coup Plotters:
Most of the sources used by Press for Conversion! editor Richard Sanders in writing the biographies of bankers, industrialists, corporations and organizations (that are detailed in "Facing the Corporate Roots of American Fascism"), are listed at the conclusion of each individual biography. However, additional online sources were used. Here is a list of the databases that were helpful in compiling these biographies of the coup plotters and financiers. Each of the following sources was used for gathering information on several of the key players involved in the fascist plot to oust FDR.

Biographical Directory of the American Congress, 1774-1949
http://search.ancestry.com/db-conbio/P400.aspx

Biographical Directory of the U.S. Congress
http://bioguide.congress.gov/scripts/biodisplay.pl?index=H000365

NameBase
http://www.namebase.org/nbhome.html

Political Graveyard Database
http://politicalgraveyard.com

Encyclopædia Britannica
http://www.britannica.com

Wikipedia
http://en.wikipedia.org

For a sizable list of donors to the American Liberty League and its front groups (for example, the Sentinels of the Republic, Crusaders, Southern Committee to Uphold the Constitution, and other fascist American organizations in the 1930s), refer to a table of data prepared by Senator Black (originally published in the Digest of Data, Special Committee to Investigate Lobby Activities, 74th Congress 2nd Session). It was later published in 1000 Americans, by George Seldes, Boni & Gaer, 1947, p. 292-298.
This table of data on donations to American fascist organizations is now availale online by Glen Yeadon, The Nazi Hydra in America, 2004.
"Appendix 1: Big Donors to the Pro-Nazi Groups, The 1930s: Nazis Parading on Main Street."
http://www.spiritone.com/~gdy52150/1930sap.html

The following are among the best sources of information on the plot:

Books:

Jules Archer, The Plot to Seize the White House, 1973
(This is the only book dealing entirely with this fascist coup plot.)

These books have chapters devoted to the fascist coup plot:
George Seldes, 1000 Americans, 1947, pp.292-298. "Table of donations to American fascist organizations that was originally published by Senator Black (74th Congress, 2nd Session, Digest of Data, Special Committee to Investigate Lobby Activities)."
(This is the source for the data in Press for Conversion! #53 on donations to the American Liberty League and its fascist front groups).

John Spivak, A Man in His Time, 1967.

Christopher Simpson, "Bankers, Lawyers and Linkage Groups," The Splendid Blond Beast, 1995.

Gerard Colby, Du Pont Dynasty, 1984

Charles Higham, Trading with the Enemy: The Nazi - American Money Plot 1933-1949, 1983.

David Kyvig, Repealing National Prohibition, 1979.

Video:

In Search of History: The Plot to Overthrow FDR, History Channel
(This is the only video documentary on the coup plot.)
http://store.aetv.com/html/product/index.jhtml?id=42344

MacCormack-Dickstein Committee documents:
Here are three PDF files containing some of the documents published by the House UnAmerican Activities Committee (HUAC):

HUAC1.pdf:
Investigation of Nazi Propaganda Activities and Investigation of Certain other Propaganda Activities
Public Statement of the Special Commmittee on Un-American Activities
House of Representatives, 73 Congress, Second Session at Washington DC, Nov. 24, 1934 (pages 1-12)

Investigation of Un-American Activites: (part 1 of) Testimony by Gerald C. MacGuire (pages 39-47)

HUAC2.pdf:
Investigation of Un-American Activites: (part 2 of) Testimony by Gerald C. MacGuire (pages 47-87), Testimony by Claude M. Adamson (of Central Hanover Bank) (pages 89-99) and (part 1 of) Resumed Testimony by Gerald C. MacGuire (pages 99-105)

HUAC3.pdf:
Investigation of Un-American Activites: (part 2 of) Resumed Testimony by Gerald C. MacGuire (pages 106-125), Testimony by James Haggett (of Lawyers County Trust) (pages 127-128), Testimony by public accountant James Rempe (pages 129-136) and Testimony by Albert Christmas (Attorney for Robert Clark) (pages 136-162).

Online Articles:

John Spivak, "Wall Street's Fascist Conspiracy: Testimony that the Dickstein MacCormack Committee Suppressed," New , Jan 29, 1935
John Spivak, "Wall Street's Fascist Conspiracy: Morgan Pulls the Strings," New Masses, Feb. 5, 1935
http://coat.ncf.ca/our_magazine/links/53/spivak-New.pdf

Glen Yeadon, "The 1930s: Nazis Parading on Main Street," The Nazi Hydra in America, 2004.
http://www.spiritone.com/~gdy52150/noon.html

The Great Depression and the New Deal (1929-1941)
Google cache: http://mciunix.mciu.k12.pa.us/~udhsweb/aphistory/file1012.htm

"One World Vision, New York City and the CFR," American Babylon - Rise and Fall
http://www.redmoonrising.com/AmericanBabylon/Part4.htm

Barbara LaMonica, "The Attempted Coup Against FDR," PROBE, March-April 1999.
http://www.webcom.com/ctka/pr399-fdr.html

L. Wolfe, "Franklin Delano Roosevelt vs. the Banks: Morgan's Fascist Plot, and How It Was Defeated," The American Almanac,
(This is divided into four installments, published: June 27, July 4, July 11, July 25, 1994.
http://www.members.tripod.com/american_almanac/morgan1.htm
http://www.members.tripod.com/american_almanac/morgan2.htm
http://www.members.tripod.com/american_almanac/morgan3.htm
http://www.members.tripod.com/american_almanac/morgan4.htm

Joseph S. Kennedy, "A plot to take over the U.S.? One military hero's story," Philadelphia Inquirer, Nov. 03, 2002
http://www.macon.com/mld/inquirer/news/local/states/pennsylvania/counties/chester_county/cities_and_neighborhoods/4429828.htm

Clayton Cramer, "An American Coup d'État?," History Today, November, 1995
http://www.claytoncramer.com/amcoup.html

Glen Yeadon and John Hawkins, The Nazi Hydra in America , Chapter 5: The 1930s: Nazis Parading on Main Street, Part 1: The Plot Against Roosevelt
http://www.spiritone.com/~gdy52150/1930s.html

"In the Mists of American Historical Memory: Five Stories," American Idealism website
http://www.americanidealism.com/stories.php?StoryID=47

Plans Hatched & Monies gathered for a coup d'etat in the United States (1934)
http://coat.ncf.ca/our_magazine/links/53/plans_hatched.html

Steve Kangas, The Great Depression: Timelines of the Great Depression
"The Business Plot to Overthrow Roosevelt"
http://home.att.net/~resurgence/Coup.htm

Mark and Kristi Fisher, "The White House Putsch," Seize the Night website
http://www.carpenoctem.tv/cons/whitehouse.html

David West, "The Low, Dishonest Decade," Hemp Times, Fall, 1999.
http://www.gametec.com/hemp/Thirties.wd6.html

"The Plot to Seize the White House" from What Really Caused World War 2?
http://threeworldwars.com/world-war-2/ww2-background.htm

Book Excerpts online:

Excerpt from Gerard Colby, DuPont Dynasty (Secaucus, NJ: Lyle Stuart, Inc.), pp. 324-330.
http://coat.ncf.ca/our_magazine/links/53/dupont-by_colby.html

Excerpt from Hans Schmidt, Maverick Marine: General Smedley D. Butler and the Contradictions of American Military History, University Press of Kentucky (1987).
http://coat.ncf.ca/our_magazine/links/53/butler03-by_schmidt.html

Excerpt (re: how Gen. Butler reacted to the House Committee's cover up of conspirators' names),
from Jules Archer, The Plot to Seize the White House, 1973
http://www.mail-archive.com/ctrl@listserv.aol.com/msg06402.html

Excerpts (re: Media Cover Up: The Plotters Deny Everything)
from Jules Archer, The Plot to Seize the White House, 1973
http://coat.ncf.ca/our_magazine/links/53/archer-denials.html

Excerpts (mostly about Gen. Butler), from Jules Archer, The Plot to Seize the White House, 1973
http://coat.ncf.ca/our_magazine/links/53/archer excerpts.html

Charles Higham, Trading with the Enemy: The Nazi - American Money Plot 1933-1949, 1983.
"The Car Connection"
http://www.thirdworldtraveler.com/Fascism/Car_Connection_TWE.html

David Kyvig, Chapter 10, "Champagne and Sour Grapes," Repealing National Prohibition (1979)
http://www.druglibrary.org/schaffer/history/rnp/RNP10.html