![]() ERDE - Explosives Research and Development Establishment.CRDE - Chemical Research and Development Establishment.CRDD - Chemical Research and Development Department.A list of abbreviations used is shown below.Missing maps and plans are shown in italics. ![]() Maps and Plans of sites other than Waltham Abbey are listed under 900-501 onward.FMD - Where a maps or plans are in particularly large format or are in fragile condition they have been stored separately in map rolls in the Fragile Map Drawer.Master - In a form intended to be employed in producing copies. This includes Ordnance Survey maps printed in large format. The maps and plans have been categorised as follows:.Where WASC appears in Maps and Plans this should be taken as a WAMP number. The series was originally incorporated in the Waltham Abbey Special Collection (WASC) and the original WASC 900 numbering prefix has been retained.This series comprises maps and plans of the Royal Gunpowder Mills and surrounding areas from 1590
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