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Per Axel Rydbergs Botanical Collecting Trips to Western Nebraska in 1890 and 1891 is written by Robert Kaul and published by Lulu.com. It's available with International Standard Book Number or ISBN identification 1609620852 (ISBN 10) and 9781609620851 (ISBN 13).
In the summer of 1891, Per Axel Rydberg and his assistant, Julius Hjalmar Flodman, collected plants in western Nebraska for the United States Department of Agriculture. They collected many first-records for Nebraska as well as some that became type specimens of Rydberg's and other botanists' names. In the following autumn and winter, Ryd-berg made a detailed, typewritten, carbon copied 35-page Report and 37-page List of specimens from that trip; one carbon copy is in the Bessey Herbarium (NEB) at the University of Nebraska-Lincoln. It is these documents that we present here, extensively annotated with our geographic clarifications, original and updated nomenclature, and citations of specimens in NEB and elsewhere.