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A log book of geyser activity is kept by park rangers and volunteers at the Old
Faithful Visitor Center. The activity reported in this log mainly concerns the
Upper, Midway and Lower Geyser Basins but other areas infrequently are
included.
Lynn Stephens, Marion Powell and Mary Beth Schwarz have undertaken the monumental task
of transcribing the handwritten log books onto the computer. Marion Powell and Mary
Beth Schwarz have compiled the logs from 1970 to 1981. Lynn has compiled the logs from 1981 to present.
As common courtesy, if you use the data here, you should
reference the log book as your source and include thanks to all of those that
have contributed to it.
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