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John A. Vucetich and Rolf O. Peterson. Wolf-Moose study annual reports. Annual reports from the National Park Service winter study on Isle Royale. Each issue, usually available in April, includes the latest information on the wolf-moose populations on the island, as well as information on other wildlife and weather conditions. Paper. 16 pages. Click on "Add to Cart" to view available annual reports. Previous years also available - contact us for details.