This is the black and white darkroom "bible" that we all were raised on in our early days. Perfect condition, looks new. This is the DataGuide with all the calculator wheels for exposure, development and enlarging. Interesting fact: A Kodak Sales Rep once told me that Kodak lost about $5 on every Master Dataguide they sold, but since the Dataguide only mentions Kodak film, paper and chemicals, they figured they would make it up by selling more Kodak branded "stuff". 3rd Edition, 1st printing, 1967. Included are two updated 1981 data sheets on Polycontrast and Plus-X. $17 + $3 shipping. PayPal OK with"gift" option.