RARE CHANCE TO ACQUIRE A PAIR OF TAYLORS MATHEMATICAL PRACTITIONERS VOLUMES INCLUDING HARRIET WINTERS INDEX FOR THE HANOVERIAN COPY. ALTHOUGH OVER SHADOWED BY GLORIA CLIFTONS DIRECTORY OF BRITISH SCIENTIFIC MAKERS THESE VOLUMES HAVE SO MUCH INFORMATION, VERY GOOD FOR CROSS REFERANCE & RESEARCH. TUDOR & STUART 3RD EDITION, HONOVERIAN 1ST EDITION. CAMBRIDGE UNIVERSITY PRESS, FOR THE INSTITUTE OF NAVIGATION.