These are typed listings of railroad-related slides made from Dubin's own collections and from other sources presumably, but not inter-filed with the two main orders, I (topic) and II (railroad companies), and listed elsewhere. Listing D was updated in ink by this writer, based on viewing the slides with Mr. Dubin.

Arthur Dubin often gave talks or prepared slides for use in articles and books.  The content includes often photos of brochures, especially their covers; menus and wine lists (ephemera); posters; and photographic prints.  

Typically Dubin engaged Hedrig-Blessing for these copy photographic slides.  

For background on Mr. Dubin and his collections, see: http://www.lakeforest.edu/library/archives/railroad/ArthurDubin.php