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USA | |
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| MacFall (1975) Gem Hunter's Guide |
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| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
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| [var. Agatized coral] Charlie Smith's Collection |
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| Mason, Anita (1976) The World of Rocks and Minerals. Larousse & Co., Inc., New York. |
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| [var. Sardonyx] Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
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| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
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| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
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| M.B. Smith, 1975, Withlacoochee River Agate: Lapidary Journal, v. 29, no. 8, p. 1590. |
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| Graves, Henry (1966) in The Agates of North America (San Diego: Lapidary Journal Inc.) |
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| Rocks & Min.: 14:78. |
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| Rocks & Min.: 14:77-78. |
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| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
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| |
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| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
Ballast Point, Tampa Bay, Tampa, Hillsborough County, Florida, USA