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Subset `rings` data.frame to years that are considered recording.
find_recording(x, injury_event)
A an fhx object dataframe.
Boolean indicating whether injuries should be considered event.
A dataframe with a column of each year which is 'recording'.
# NOT RUN { require(plyr) data(lgr2) ddply(lgr2$rings, 'series', burnr:::find_recording, injury_event = TRUE) # }
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