Search Constraints
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Creator Personal Names
Tryon, Earl H. (Earl Haven)
Remove constraint Creator Personal Names: Tryon, Earl H. (Earl Haven)
All Subjects
Canker (Plant disease)
Remove constraint All Subjects: Canker (Plant disease)
Subject Topical
Birch--Diseases and pests.
Remove constraint Subject Topical: Birch--Diseases and pests.
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