( 1) General reference
Hull Museum Publication No.42 March 1907 p3 illus fig. 1 (T. Sheppard)
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( 2) General reference
Hull Museum Publications No.40 3rd Edn 1909 pp17-8 (T. Sheppard)
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( 3) General reference
Lincolnshire Notes and Queries 14 1916-7 p65 (T. Sheppard)
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( 4) Field Investigators Comments
F1 FDC 27-MAR-63
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