Brand/Publisher: International Textbook Company, Scranton, Pennsylvania (I.C.S. Staff authorship).

Titles included: "Elements of Algebra Parts 1-4" (291B); "Plane Trigonometry Parts 1-2, Trigonometric Tables" (319B); and "Trigonometry—Slide Rule—Mechanics: Trigonometry and Graphs, The Slide Rule, Mechanics and Machine Elements" (145B).

Format: Three matching small black hardcover volumes with textured boards, embossed front titles, and gilt lettering on the spines.

Endpapers feature blue marbled pattern; one volume has an ownership inscription reading "William McGrath 1/1/42" on the front endpaper.

Subjects covered include algebra fundamentals, plane trigonometry, trigonometric tables, trigonometry and graphs, slide rule use, and basic mechanics and machine elements—ideal for vintage engineering or correspondence school collections.