R-block staging entry validated for model fit. Imported from staging batch duell-thimm-r, source entry 1813.
Gelli states that the undated second edition belongs to the 1837 introductory course family and that the 1837 work itself is a reduction of Roland's 1828 treatise.
Vigeant 1882 describes the 1837 Introductory Course as a theoretical reduction of George Roland's 1823 treatise and also notes an undated second edition printed at Edinburgh. phase 89: former work 1881 individually reviewed and consolidated here.