The American Polygraph Association is the principal organization representing polygraph operators in the U.S.
AntiPolygraph.org is the preeminent clearing-house for information about the polygraph. Despite an evident skepticism about the reliability of various deception detection techniques, it hosts many different views and holds a valuable cache of rare documents about the history of lie detection.
The Bancroft Library of the University of California, Berkeley houses the bulk of the private papers of Leonarde Keeler and John Larson, as well as the papers of August Vollmer and the Berkeley Police Department.
The Department of Defense Polygraph Institute is one of the U.S. government’s premier training and research centers for the detection of deception. The Institute also houses an important set of papers that once belonged to Leonarde Keeler.
The Northwestern University, University Archives house the papers relating John Henry Wigmore and his successors as dean of the Northwestern Law School, as well as the papers of the Scientific Crime Detection Laboratory.
The Wonder Woman pages highlight the early history of the comic, when it was being written by Charles Moulton, the pseudonym for William Moulton Marston.
The Virtual Laboratory of the Max Planck Institute for the History of Science, Berlin is an excellent source for original texts devoted to early years of the pyscho-physiological sciences.