Library, 1. L. I. I. Surveying: Theory and practice. Philadelphia, Pa. : Lefax.
Lua i Stíl Chicago (17ú heag.)Library, 11674 Lefax Instant Information. Surveying: Theory and Practice. Philadelphia, Pa. : Lefax.
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Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.