| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Swedes of Greater Worcester | 978-0-7385-1089-7 | 2002 | William O. Hultgren · Phil C. Becker |
| Swedes of Greater Worcester Revisited | 978-0-7385-3756-6 | 2005 | William O. Hultgren · Philip C. Becker |
| Worcester, 1880-1920 | 978-0-7385-1210-5 | 2003 | William O. Hultgren · Frank J. Morrill |
| Worcester | 978-0-7385-3864-8 | 2005 | Frank J. Morrill · William O Hultgren |