Two booklets dealing with Shemittah Etrogim – halachic polemic aroused by Rebbe Yoel Teitelbaum of Satmar against using Etrogim grown in Eretz Israel relying upon Heter Mechirah:
1. Kuntress Shalosh Teshuvot by Rebbe Yoel Teitelbaum of Satmar. Brooklyn, New York: Twersky Brothers, 1953.
Three responsa on the above topic, in which Rebbe Yoel of Satmar rules decisively that one shouldn't buy, make a blessing or fulfill one's obligation with such an Etrog.
[3], 4-94 pages. 23 cm. Good condition. Minor stains. Original binding, slightly worn.

2. Milchemet Mitzvah, by R. Yitzchak Yechiel HaKohen Gross author of Igeret L'Nevochim. Jerusalem: Chorev, 1959.
Booklet defending the position of R. Yoel Teitelbaum against the objections of R. Kahanov in Torat HaSheviit on R. Teitelbaum's ruling.
[7], 6-51, [1] pages. 23 cm. Good condition. New leather binding.