You've got what you needed from Isabelle, so all's fine. But may I mention that Bühler's 1877 report is in the collection of scanned catalogues at
http://catalogues.indology.info (Biswas 846), along with zome of the other reports by Bhandarkar, Kielhorn etc. Coverage is spotty, but I add such reports whenever I find them. The Bühler 1877 PDF is the one scanned by GRETIL.