References
- Barnett , P. R. O. and Hardy , B. L. S. 1967 . A diver-operated quantitative bottom sampler for sand macrofaunas . Helgoländer wiss. Meeresunters , 15 : 390 – 397 .
- Gibson , A. H. 1925 . Hydraulics and its applications 801 New York : Van Nostrand .
- Zoutendyk , P. 1971 . “ A self-contained diver-operated air-lift pump for quantitative sampling of infratidal rock communities ” . In Baralogia Proc. 1st. 2nd. S. Afr. Symp. Underwat. Sci 108 – 112 .