Hauff on Modern Developers: How to Use Them, G. Gennert (New York, NY), Catalog N, undated c. 1910, ~4 ½"x6 ½", 80pp
This diminutive booklet from G. Gennert has no camera ads, but it serves as a reminder of what the cameras are all about - producing photographic images. Contained therein are detailed instructions and properties of the line of Hauff (from Germany) developers offered by Gennert at the time. There is no date, but the Sylvar lens advertised on the inside back cover is not found in the c.1908 Gennert Catalog No. 58, but is found in the c.1919 Gennert Catalog No. 72 as well as later. This booklet can therefore be estimated as c. 1910.
