Kaestlin's attention to detail and fastidious collecting habits are evident in the layout and handwriting in his albums. His collection, donated to the Smithsonian Institution in 1984 by his niece Vera Madeleine Kaestlin-Bock, includes more than 1,250 album pages on which he organized more than 14,000 Imperial Russian and zemstvo stamps. The quality of the stamps is outstanding. With the publication of this book, Kaestlin can finally take his place among the greats of Russian philately. The G.H. Kaestlin Collection of Imperial Russian and Zemstvo Stamps is one of the greatest museum collections outside of Russia.