NEGATIVE/SLIDE CODE KEY:

 RN        =  RARE NEGATIVE

RGP      =  RARE GLASS PLATE NEGATIVE

CN        =  COPY NEGATIVE

RCN     =  RARE COPY NEGATIVE

CS        =  COLOR SLIDE

COLOR = COLOR NEGATIVE

NEGATIVE FORMAT KEY:

SEE 4x5      =  NEGATIVES ARE 4x5   FORMAT NEGATIVES

SEE 4x6      =  NEGATIVES ARE 4x6   FORMAT NEGATIVES

SEE 5x7      =  NEGATIVES ARE 5x7   FORMAT NEGATIVES

SEE 8x10    =  NEGATIVES ARE 8x10 FORMAT NEGATIVES

GLASS PL    =  NEGATIVES ARE GLASS PLATE NEGATIVES