If you have any Ballantine or Del Rey mass market paperback edition of The Hobbit please consider spending just few minutes of your time taking this survey.

I'm trying to narrow down precisely where some changes and/or reset of the text were made, together with changes to the cover in the 2001 edition (I got in touch with Devon at tolkienbooks.us on this part).

Those the edition I have/work on:
A3f-A
– A3f-1 1st impression 1965
A3f-B
– A3f-2 2nd impression 1965
– A3f-5 5th impression 1965
A3gα-A
– BB1966-3 3rd impression 1966
– BB1966-14 14th impression 1968
A3gα-B
– BB1966-36 36th impression 1972 | 034501532-0 TB.us
– BB1966-56 56th impression 1975 | 034524826-0 TB.us
– BB1966-57 57th impression 1975 | 034524826-0 TB.us
A3gβ
– BB1966-59 59th impression 1976 | 034525342-6 TB.us
– BB1982-13 Reset 1982 | 13th impression 1985 | 034533207-5 TB.us
A3cc
– BB1982-34 Reset 1988 | 34th impression | 034533968-1 TB.us
– DR2000-4 Reset 1988 | 106th (4th thus) impression | 034533968-1 TB.us
5α-2001A
– DR2001-6 Del Rey paperback 2001 Reset | 132nd (6th thus) impression | 034533968-1 TB.us
– DR2001-18 Del Rey paperback 2001 Reset | 132nd (18rh thus) impression | 034533968-1 TB.us
– DR2001-21 Del Rey paperback 2001 Reset | 135th (21st thus) impression | 034533968-1 TB.us
5α-2001B
– DR2014-17 Film Tie-In Del Rey Edition 2014 | 20th (17th thus) impression | 978-034553483-5 TB.us

Thank you!
Please, take this survey for every edition you have and I'll be very grateful if you help me share the link :D
https://forms.gle/WsJhrjwvGTP4SuME9