Print books may have an index, but not all indexes are created equally. I recently purchased a reprint of several landowner atlases for one Iowa county. The back contains an index which is very helpful. However that index only indexes the names of the landowners as shown on the property maps. It does not index the names in the biographies, photographs, or other lists that the book published.
When using any print index, determine just what the index is indexing. Looking for your name in the index without knowing that key detail may cause you to overlook information.