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Creator Personal Names
Purvis, Matthew Robert, 1929-
Remove constraint Creator Personal Names: Purvis, Matthew Robert, 1929-
All Subjects
Fire-blight.
Remove constraint All Subjects: Fire-blight.
Subject Topical
Beans--Diseases and pests.
Remove constraint Subject Topical: Beans--Diseases and pests.
Subject Topical
Plant exudates.
Remove constraint Subject Topical: Plant exudates.
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