Correspondence, legislation, news clippings, reports, memoranda, and subject files related to Holland's service in the U.S. Senate from 1946 to 1971. This series is organized into several sub-series according to Congress and session. Within each session sub-series, it should be noted that the date span covered by the materials exceeds the date span for that session of Congress. For example, a file related to a 1946 piece of legislation may contain reports and other material dating from the late 1930s or early 1940s, which predate the 80th Congress 1st Session sub-series in which the file is located. Although Holland's activities on numerous committees are documented in part by this series, the official committee records are maintained by the federal government.

The files in this series were originally arranged according to the File Code of the U.S. Senate. Under this scheme, each branch of the government and the various offices and departments under each branch were assigned a particular number. For example, the President was assigned Filing Code 1, the State Department was assigned Filing Code 2, the Treasury Department was assigned Filing Code 3, etc. Although the filing code numbers are no longer maintained in this finding aid to the Holland Papers, the arrangement still exists. As such, files dealing with the President are located at the beginning of each sub-series, followed by the State Department, followed by the Treasury Department, and so on.

Correspondence, legislation, news clippings, reports, memoranda, and subject files related to this session of Congress. Of particular interest are files related to the Army Engineers and flood control and drainage districts, the Florida East Coast Railway, labor legislation, sugar quotas and problems, rent control, the War Assets Administration and various air fields and bases in Florida, socialized medicine, and the Everglades. There are several files pertaining to post-war foreign policy, including the Marshall Plan, Palestine, the United Nations, foreign relief, and Greece and Turkey.

Correspondence, legislation, news clippings, reports, memoranda, and subject files related to this session of Congress. Of particular interest are files related to the citrus industry, the Army Engineers projects in Florida, the Democratic National Committee, labor legislation, civil rights, the War Assets Administration and various air fields and bases in Florida, flood control legislation, and the Everglades. There are several files pertaining to post-war foreign policy, including the Marshall Plan, communism, Palestine, the United Nations, and foreign aid. Among the legislation sponsored or co-sponsored by Holland is a file pertaining to the poll tax and Holland's opposition to it.