Horner, H. A. Ordinary national certificate mathematics / [electronic resource] / H.A. Horner.. — 2nd ed. in SI Units.. — London : : Heinemann Educational,, 1970-1971.. — 2 v. ; 21 cm. Includes index. ISBN: 0435710826 (v. 1) 9780435710828 (v. 1) 0435710818 (v. 2) 9780435710811 (v. 2) Subjects--Topical Terms: Mathematics.Mathematics--1961- LC Class. No.: QA39.2 Dewey Class. No.: 510