I’m not sure if they’ve been collected. They were a series of letter-essays published in journals of economic history / political sciences.

Eg

https://www.researchgate.net/publication/232889148_Arguing_from_errors_On_certain_issues_in_Robert_Davies’_and_Stephen_Wheatcroft’s_analysis_of_the_1932_Soviet_grain_harvest_and_the_Great_Soviet_famine_of_1931_-_1933

https://agrarianstudies.macmillan.yale.edu/sites/default/files/files/papers/TaugerAgrarianStudies.pdf

Edit - most or all seem collected here https://newcoldwar.org/archive-of-writings-of-professor-mark-tauger-on-the-famine-scourges-of-the-early-years-of-the-soviet-union/

You can steal most of Tauger’s work from libgen http://libgen.is/search.php?req=Mark+tauger