Tobruch defences, Dec. 1940 [cartographic material] /

Ed. of 25 Dec. 1940. Topographic map of the Tobruk region, Libya. British reproduction of a 1936 Italian map, with Italian defences at 25 December 1940 overprinted in blue and a grid overprinted in purple. Blue overprint shows artillery batteries in place and projected, various HQ units, coastal and anti-aircraft defences, pipelines, cables and telephone exchanges. Relief is shown by contours and spot heights.; At bottom left corner of sheet: D.R 58.; Reproduced "From an Italian map dated 1936".; At top right corner of sheet: "Not to be published".; "This sheet is gridded with 'Purple' Grid based on Long. 27°E".; "Grid North is 01°43'48" west of True North".; Also available online http://nla.gov.au/nla.map-vn3356739.Tobruk defences, Dec. 194