The following are sources for historical postcards at the University of California Berkeley Library Digital Collection, Spokane Public Library Digital Collection and the Whitworth University Archives and Special Collections.
University of California Berkeley Library Digital Collections
University of California Berkeley Library Digital Collections (Kransky collection of Mitchell postcards) with 300 records in the collection searching on Spokane. There are postcards for some other locations in Washington; search by the specific location name (i.e. Wenatchee, Yakima, Walla Walla).
The following is a link on the permission policy use and the format source listing instructions: https://www.lib.berkeley.edu/about/permissions-policies
The format to use for crediting the source of the historical postcard is as follows:
Identification of the item
Example: Apple Picking, Walla Walla, Washington
Name of the Collection
Example: Walter Robert and Gail Lynn Kransky collection of Edward H. Mitchell postcards
Call Number of Collection
Example: Card Number: 1486
Name of the UC Berkeley Library
Example: The Bancroft Library, University of California, Berkeley.
Example: Digital Image Information from Search on Walla Walla Used for Citing the Source:
Spokane Public Library Digital Image and Postcard Collection
Spokane Public Library (https://lange.spokanelibrary.org/collections/browse) which includes both pictures and postcards. Search on Spokane and areas in Eastern Washington. There are 1,452 items in the collection.
For the Spokane Public Library, there is information on each picture and postcard to use when providing the sources. Use a format that includes the title/subject, date of item if available, name of the collection, name of the organization where you obtained the image in italics, and the link and item number and access date if available.
An example:
The Plunge Pool; Interior of the Plunge Natatorium Park, Spokane Wash., 1910-1920 “Interior of Plunge, Natatorium Park, Spokane, Wash.,” Spokane Public Library, accessed July 13, 2024, https://lange.spokanelibrary.org/items/show/4319.
Whitworth University Archives and Special Collections
Their digital collection includes historic postcards of Pacific Northwest Churches: https://libguides.whitworth.edu/archives/digital