bCount made during reduction.
cIncludes 38 natural mortality.
Actual counts exclude loss figures.
Counts are postreduction, precalf.
Losses are mostly reductions.
Counts before 1951-52 are ground unless marked with A. Beginning in 1951-52,
all counts are aerial.
Changes have been made from previous tabulations (Skinner and Alcorn, 1942-51)
according to more accurate information.