H. E. Wright; A square-rod piston sampler for lake sediments. Journal of Sedimentary Research ; 37 (3): 975–976. doi: https://doi.org/10.1306/74D71807-2B21-11D7-8648000102C1865D
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The Livingstone-Vallentyne piston sampler has been further modified by replacing the spring catch with splines on a square rod, in order to strengthen the critical points of greatest stress and permit pounding when necessary.
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