TY - CONF T1 - Zodical Light and Counter-Glow and the Photography of Large Areas and Faint Contrasts T2 - Royal Photographic Society of Great Britain Y1 - 1915 A1 - Douglass, A.E. KW - astronomy KW - contrasts KW - counter glow KW - Douglass KW - photography KW - zodical light JF - Royal Photographic Society of Great Britain ER -