The War Office, 1924 for Part I and 1923 for Part II.  
Part I – Range Table for 18-pr. Q.F. Guns, Marks I-IV, Standard Projectiles; 2 C.R.H.: Shrapnel, fuzed 80(Wt. 18 ½ lb.), Stream-line: H.E. 4/7 ½ (C), fuzed 115 type; Incendiary: 2 C.R.H., 66 pages including Index, charts and Addenda.  Dated January, 1924.  Stamped by Royal School of Artillery (Mobile) Sep 17 1924, Kingston, Ont.  Pages have some stains; prior owner’s notes and corrections.
Part II dated April, 1923. – Covers Sequence of Orders, Line of Fire, Concentration and Distribution, Angle of Sight, Position Corrections, Elevation, Calibration Form, Probability Factors and Zones, Crest Clearance, Ranging, Target, Codes, Computation, Form for Measurement, Measures of Distances, Areas, etc., Trigonometrical Functions, Mathematical Tables and Artillery Code.  62 pages followed by fold-out artillery code pages.  Includes charts and illustrations; prior owner’s notes on last blank page.
The two tables have been bound in a leather covering showing use and age wear.  Cover pages for Part I are browned with interior pages a bit tanned, legible with some stains and age spotting.  Part II is unmarked with a few stains and age-spotting.