Halachic Issues of Heter Mechirah [Part 1] (Shemittah #18 - Heter Mechirah B)
Rabbi Dovid Cohen
Inherent Halachic Issues Part 1 - Tabu - Ha'aramah/Gemiras Da'as (ha'aramah be'd'rabannan, mechiras chametz, Devarim shebilev) But the book at www.kashrushalacha.com