collection of approximately 300 covers in two binders, includes early real estate/land agent cornercards, 1859 illustrated Richmond House cornercard, 1860 Illinois Central Railroad cover, early star die entires, 1862 Briggs House cover with enclosure, October/November 1862 black postmarks, 1863 "Seeds and Farming Implements" illustrated advertising cover, ca. 1867 carrier backstamp, 1869 pair of Black Jacks on cover, Pictorials including 2c, 3c, and 6c, 1871 "Chicago, Rock Island & Pacific Railroad" datestamps, negative "E" cancellation on cover to Montgomery Blair, multicolored "National Printing Co." covers, attractive advertising throughout, interesting contents, many different postmarks as identified in the Piszkiewicz book, and much more, some mixed condition to be expected but generally fine to very fine or better, this collection formed much of the basis of Len Piszkiewicz's research and as such serves as a very important holding for the Chicago postal historian, a wealth of information to be gained from close examination