| Reference | {Deposit:: NEVIUS, J.N., 1901, ROOFING SLATE QUARRIES OF WASHINGTON COUNTY; NEW YORK STATE GEOLOGIST 19TH ANNUAL REPORT, P. 142}{Deposit:: DALE, T. NELSON, 1914, SLATE IN THE UNITED STATES: UNITED STATES GEOLOGICAL SURVEY BULLETIN 586, P. 124, PL. 22}{Deposit:: LUEDKE, E.M., WRUCKE, C.T., AND GRAHAM, J.A., 1959, MINERAL OCCURRENCES OF NEW YORK STATE WITH SELECTED REFERENCES TO EACH LOCALITY: UNITED STATES GEOLOGICAL SURVEY BULLETIN 1072-F, P 441} |