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The JJR photographic slide collection relates solely to the firm's Michigan projects. The files are arranged into three series: Michigan; University of Michigan; and Other Michigan Universities. Included are slides of project sites (with some aerial images), site plans, and conceptual drawings. Although the collection covers the entire state, the bulk of the slides relate to southeast and lower Michigan, especially Ann Arbor, Detroit, Flint, Grand Rapids, and Saginaw. The files are in the order maintained by the organization. There is thus some overlap between the general Michigan series and the University of Michigan and Other Michigan Universities series. The researcher is advised to examine the finding aid closely.

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.