Letchworth, Stevenage, Hitchin & Baldock including Great Offley, Pirton, Preston, Old Knebworth, Walkern and Weston : past and present map, 1834 to present day.
Cassini Maps (Firm).
Great Britain.Ordnance Survey.
[East Garston] : Cassini Publishing,
c2006.
Relief shown by contours, shading, spot heights and hachures.
"4 maps from 4 periods."
A brief history and overview of Ordnance Survey's Old Series mapping.
Sheet indicator showing Old Series maps used.
Reproductions from the first 3 series, originally published at one inch to a mile (1:63,360), have been enlarged to 1:50,000 and re-projected.
"Digitally enhanced reproductions of three series of Ordnance Survey one-inch maps."
Map 1, Ordnance Survey Old Series (1834), sheet 46 -- Map 2, Ordnance Survey Revised New Series (1896), sheet 221 -- Map 3, Ordnance Survey Popular Edition (1919-1920), sheets 95 and 96 -- Map 4, Ordnance Survey 1:50,000 mapping data (present day).