Crossword puzzle clue "prof rhine's specialty"

Here are the possible solutions for prof rhine's specialty clue

Answer
Clue
Relevancy
esp
Clue
Prof. Rhine's specialty
Prof. Rhine's concern
J. B. Rhine specialty
Dr. Rhine's specialty
alum
Clue
Visitor to an old prof, perhaps
Prof's visitor, maybe
Visitor to an old prof
Definition
a sulphate of ammonium and potassium, used as a mordant
amat
Clue
Not prof.

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