1. Introduction to Statistical Analysis;Dixon,1951
2. Subsurface Exploration and Subsampling for Civil Engineering Purposes;Hvorslev,1949
3. Free-fall coring tube; a new gravity bottom sampler;Hvorslev;Bull. Geol. Soc. Am.,1946
4. The piston core sampler;Kullenberg;Svenska Hydrograf. Biol. Komm. Skrifter, Tredje Ser. Hydrograf.,1947
5. Deep-sea coring;Kullenberg;Repts. Swedish Deep-Sea Expedition,1955