Pit & quarry.

v.3; v.5 (1920-21); v.6 (1921-22); v.7 O-S(1922-1923); v.9 1924-1925; v.10 1925 Apr-Sep; v.11 1925-1926 Oct-Mar; v.12:2 JY-S(1926); v.12:1 AP-JE(1926); v.12 1926 Jul-Aug; v.12 no.1-4 1926; v.13 OC-MR(1926-1927); v.13 1926-1927 Mar Oct; v.14 AP-S(1927); v.14 no.13; v.15 no.1-5 1927; v.15 OC-MR(1927-1928); v.15 no.7-13 1928; v.16 AP-S(1928); v.16 1928 Apr-Sep; v.17 1928 -1929 Oct-Mar; v.18 AP-S(1929); v.18 1929 Apr-Sep; v.19 1929-1930 Oct-Mar; v.20 AP-S(1930); v.20 1930 Apr-Jun; v.20 1930 Jul-Sep; v.21 1930 Oct-Dec; v.21 OC-MR(1930-1931); v.21 1931 Jan-Mar; v.22 AP-S(1931); v.22 1931 Apr-Jun; v.22 1931 Jul-Sep; v.23 1931 Oct-Dec; v.23 OC-MR(1931-1932); v.24 AP-S(1932); v.25 JE-MR(1932-1933); v.26 JY-JE(1933-1934); v.27 JY-JE(1934-1935); v.28 1935-36 JY-JE; v.29 JY-JE(1936-1937); v.30 JY-JE(1937-1938); v.31 JY-JE(1938-1939); v.34 JY-JE(1941-1942); v.35 JY-JE(1942-1943); v.36 JY-JE(1943-1944); v.37 JY-JE(1944-1945); v.38 JY-JE(1945-1946); v.39 1946-1947; v.40 1947-1948; v.41 1948-1949; v.42 1949-1950; v.43:1(1950); v.43:2(1951); v.43 1950-1951; v.43JAN-JUNE 1951; v.44:1(1951); v.44:2(1952); v.44JULY-DEC 1951; v.44 1951-1952; v.45:1(1952); v.45:2(1953); v.45 1952-1953; v.47 no.2 1955 Jan-Jun; v.48:1-6(1955); v.48 no.1 1955 Jan-Dec; v.48 no.2 1956 Jan-Jun; v.49 no.1 1956 Jul-Dec; v.49 no.2 1957 Jan-Jun; v.50:7-12(1958); v.50 no.1 1957 Jul-Dec; v.50 no.2 1958 Jan-Jun; v.51:7-12(1959); v.51 no.1 1958 Jul-Dec; v.51 no.2 1959 Jan-Jun; v.52 no.1 1959 Jul-Dec; v.52 no.2 1960 Jan-Jun; v.53 1960 Jul-Dec; v.53 1961 Jan-Jun; v.54 no.1 1961 Jul-Dec; v.54 1962 Jan-Jun; v.55 1962 Jul-Dec; v.55 1963 Jan-Jun; v.56 1963 Jul-Dec; v.56 1964 Jan-Jun; v.57 1964 Jul-Dec; v.57 1965 Jan-Jun; v.58 1965; v.58 1966 Jan-Jun; v.59 1966 Jul-Dec; v.60 1967 Jul-Dec; v.60 1968 Jan-Jun; v.61 1968 Jul-Dec; v.61 1969 Jan-Jun; v.62 1969 Jul-Dec; v.62 1970 Jan-Jun; v.63 1970 Jul-Dec; v.63 1971 Jan-Jun; v.64 1971 Jul-Dec; v.68 1975 Jul-Dec