Chamber's Seven-Figure Mathematical TablesPublished by: W & R Chambers, London, 1947Edited by: James PrydeNew Edition: Extended Explanation of the Tables by: Walter F Robinson and edited by Archibald MilneThese books were lifelines for engineers, surveyors & navigators, pre  the calculator and computer age.This particular copy is well travelled from purchase at Anthony Horderns in Sydney, to Meadowbank, Coonamble and Tamworth!It has been covered in contact plastic, so the covers remain in quite good condition.  Internally the pages are intact and the text is clear, there is some age related yellowing and some previous user's annotations.