Symons, G.J. (1892). ‘Hydrographical Map of the Thames Basin – Mean [Annual] Rainfall’. Royal Commission on Metropolitan Water Supply. Hand coloured lithographed map,
Symons, G.J. (1892). ‘Hydrographical Map of the Thames Basin – Mean [Annual] Rainfall’. London County Council for Royal Commission on Metropolitan Water Supply. Hand coloured lithographed map, 63 x 85.5 cm, at 1:253,440. Dissected, mounted on linen and folded to 28.5 x 31.5 cm, between marbled soft card covers with manuscript label. Cover worn with bumped, torn corners and soiled on linen folds. Map clean, age-toned, linen sound. In fair to good condition. NOT GEOLOGICAL.