Caption title: An improved system, &c. This title may also be available on microopaque as part of the collection Early American imprints, Second series (New York: Readex Microprint Corp., 1964- ). AVAILABLE ONLINE TO AUTHORIZED PSU USERS.
Electronic text and image data. [Chester, Vt. : Readex, a division of Newsbank, Inc., 2004-2007] Includes files in TIFF, GIF and PDF formats with inclusion of keyword searchable text. (Early American imprints. Second series ; no. 41181).