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    Archive Number
    6438713
    Description
    Nine CBA County Petrology Key Maps, collated by Christopher Houlder, between 1950-1985.
    Collection Name
    CHH - C.H. Houlder Collection
    Medium
    9 maps. Graphic.
    Originator
    Christopher H. Houlder, RCAHMW
    Date
    c. 1950 to 1980