Saul, J.W.

Navigation by Position Lines or Marcq St. Hilaire Method.

[First Edition]. London, Imray, Laurie, Norie & Wilson, [1920]. 18 x 12 cm. 17 pages. With a folding chart. Original dark cloth with gilt title on front board. Ex Libris on front free end paper. Very good condition. Rubbed and bumped. Some stains on front board. Internally clean.

Sommerville, D.M.Y.

Analytical Geometry of Three Dimensions.

First Edition. Cambridge, At the University Press, 1934. 22 x 14 cm. xvi, 416 pages. With line diagrams. Original dark green cloth. Hard cover with gilt title on spine. Very good condition.