He found that Wallace had published 22 full-length books and at least 747 shorter pieces, 508 of which were scientific papers (191 of them published in Nature).
Ia mendapati bahwa Wallace telah menerbitkan 22 buku lengkap dan setidaknya 747 berupa penggalan-penggalan yang lebih singkat, 508 di antaranya merupakan karya ilmiah (191 dipublikasikan di jurnal Nature).