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Ann Arbor, Michigan based hydraulic engineer known for his multiple arch dams, hydroelectric plants, and for developing the Hazen-Williams hydraulic tables, designed and consulted on numerous water power and dam projects. Papers include biographical files, material relating to construction of dams and power plants on the Huron River and elsewhere, and papers relating to Michigan Engineering Society.

The papers of Gardner Williams, 1900-1931, include biographical material; papers relating to the history of Michigan Engineering Society; project files detailing construction of Huron River power plants and dams at Argo, Barton, Geddes, Superior, and French Landing; other Michigan project files for dams and plants in Sault Ste. Marie and elsewhere; Detroit Edison consultation materials; engineering reports by, or including comments of, Williams; and photographs.

The Williams papers came from the offices of Ayres, Lewis, Norris and May, Ann Arbor engineering firm. Obviously a fragment, they cover only the period of 1900 to 1931, with photographs spanning the dates 1900 to 1945.

The collection begins with a folder of biographical material and a folder regarding the history of the Michigan Engineering Society. Except for these, the collection divides into four series: Power Plants and Dams, the Detroit Edison Company, Engineering Reports, and Photographs.

The Penrod/Hiawatha Company collection is mainly comprised of postcards, although some supplemental photographic items directed toward tourists is also included. The postcards, numbering more than 5,000, primarily are of the Michigan landscape and its towns and cities, covering every region of the state. Typical postcard themes dominate, particularly natural scenery, outdoor recreation, and shopping districts. The postcards date from the 1950s through the opening decades of the twenty-first century, although very few display copyright dates. The collection is divided into the following series.

1. Non-Postcard Items (calendars, brochures, booklets): Box 1
2. Non-Penrod/Hiawatha Postcards: Box 2
3. Penrod/Hiawatha Postcards, 1970s-1990s: Boxes 2-5
4. Penrod/Hiawatha Postcards, mid- to late 1990s: Boxes 5-6
5. Penrod/Hiawatha Postcards, late 1990s-2000): Boxes 6-7
6. Penrod/Hiawatha Postcards, 2001-2004: Box 8
7. Penrod/Hiawatha Postcards, 2005-2014: Box 9
8. Oversize and miscellaneous: Box 10

As batches of postcards are received every years, it was decided to arrange the items in blocks of time according to the date of their accession. Thus for the researcher interested in a specific city, it will be necessary to examine the listing for each of the series.