Perhaps you should try some spelling variations:
"a robert e. heilmann book" » "3 robert e. heilmann book", "dr robert e. heilmann book", "a robust e. heilmann book", "a robert _. heilmann book", "a robert j. heilmann book", "a robert e. heilemann book", "a robert e. heimann book", "a robert e. heilman book", "a robert e. heilmann books", "a robert e. heilmann ebook"
"a robert b. heitmann ebooks" » "3 robert b. heitmann ebooks", "dr robert b. heitmann ebooks", "a robust b. heitmann ebooks", "a robert _. heitmann ebooks", "a robert j. heitmann ebooks", "a robert a. heitmann ebooks", "a robert b. heitmann ebookss", "a robert b. heitmann eebooks", "a robert b. heitmann books", "a robert b. heitmann ebook", "a robert b. heitmann redbooks"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("a robert e. heilmann book") or ("a robert b. heitmann ebooks"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("a robert e. heilmann book") OR ("a robert b. heitmann ebooks")).
• Removing quotes may allow a broader search: (( a robert e. heilmann book ) or ( a robert b. heitmann ebooks )).
• Adding a wildcard symbol may retrieve word variants: (("a robert e. heilmann book") or ("a robert b. heitmann ebooks"))*.