Lumb Hole - additional information
References
(1956) , The Speleologist Vol.1. No.4., ,
(1975) , Trans. B.C.R.S. Vol.2. No.1., p.8.,
(1978) , Bull. P.D.M.H.S. Vol.7. No.2., p.110., Peak District Mines Historical Society
(1995) , CCPC N/L. Survey., , Crewe Caving and Potholing Club
(2000) , CCPC N/L No. 64., p.6., Crewe Caving and Potholing Club
(2010) , Caves of the Peak District, p. 304, DCA