One of the kinds of library postcards that I collect is postcards depicting bookmobiles. This postcard showing a 1948 Gerstenslager bookmobile for the Greene County (OH) Public Library is a Real Photo Postcard (RPPC). RPPCs showing bookmobiles are unusual so I was happy to add this one to my collection. It is also unusual in that it was used as a promotional piece for the Gerstenslager Company's bookmobiles. I've written a previous post about these Gerstenslager postcard advertisements. The Greene County Public Library continues to operate a bookmobile. There are lots of images of bookmobiles on the Web. One of the best sites for these images is the Pinterest bookmobile site of the American Libraries magazine. I have a tribute to bookmobiles on the Library History Buff website. I also compiled a list of the best bookmobile websites.