These are some wonderful apple illustrations created by Alios Lunzer and featured in the Brown Brothers Continental Nursery Catalog in 1909.  Alios Lunzer was an Austrian-born watercolour painter born in 1840, who emigrated to Philadelphia and specialized in doing botanical illustrations.  

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All illustrations by Alois Lunzer originally from the Brown Brothers Continental Nursery Catalog, 1909 - (public domain) sourced from Wikimedia Commons.