Stone testing of rocks from North Wales stone quarries (1950-1951), Arcow Quarry, Horton in Ribblesdale and Settle (1963-1965).
See also EMP/4/O/5 and EMP/4/O/14.
Stone testing of rocks from North Wales stone quarries (1950-1951), Arcow Quarry, Horton in Ribblesdale and Settle (1963-1965).
See also EMP/4/O/5 and EMP/4/O/14.