Client-Centered Therapy: Its Current Practice, Implications, and Theory, by Carl Rogers (HC, 1951, has some underlining, $6, which is 1/3 the internet price.)
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On Becoming a Person: A Therapist's View of Psychotherapy, by Carl Rogers (HC, 1961, stained cover, $3.50, which is 1/3 the internet price.)
Look for these books in the psych. section