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  1. By: Thomas, Barry A. - Spicer, Robert A
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 40
    Issue: 5
    Date: 1986-12-18
    Page Range: 293--297
    Publication Info: London, BM(NH),
  2. By: Parrish, Judith T - Spicer, Robert A
    Type: Article
    In: Palaeontology
    Volume: 31
    Date: 1988
    Page Range: 19--34
    Publication Info: London, Palaeontological Association, 1957-
  3. By: Spicer, Robert A - Burnham, Robyn J. - Grant, Paul - Glicken, Harry
    Type: Article
    In: American fern journal
    Volume: 75
    Date: 1985
    Page Range: 1--5
    Publication Info: [Washington, etc.] American Fern Society
  4. By: Spicer, Robert A
    Type: Article
    In: Palaeontology
    Volume: 20
    Date: 1978
    Page Range: 907--912
    Publication Info: London, Palaeontological Association, 1957-