AR-66-1922-07-15-letter-geology-from-r-j-carlowitz-1

AR-66-1922-07-15-letter-geology-from-r-j-carlowitz-2

AR-66-1924-02-29-letter-from-r-wilshusen-1

AR-66-1924-02-29-letter-from-r-wilshusen-2