Barrett, J. R. (1971). Rapid drawdown in earth dams.
Lua i Stíl Chicago (17ú heag.)Barrett, John Russell. Rapid Drawdown in Earth Dams. 1971.
Lua MLA (8ú heag.)Barrett, John Russell. Rapid Drawdown in Earth Dams. 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.