TY - BOOK AU - Lau, Ernst AU - Krug, Wolfgant TI - Equidensitometry: methods of two dimensional photometry, principles and fields of application T2 - The Focal Library PY - 1968/// CY - London PB - The Focal Press KW - Microdensitometers KW - NASA Thesaurus KW - Optical Measurements KW - Photography ER -