Tracklist
| A | Groovy Grubworm | 2:08 |
| B | Groovy Grubworm | 2:08 |
Notes
Black vinyl promo version.Other versions
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| PL 28 | Harlow Wilcox And The Oakies | Groovy Grubworm (7", Single) | Plantation Records | PL 28 | US | 1969 |
| FK3343 | Harlow Wilcox And The Oakies | Groovy Grubworm (7", Single) | Festival Records | FK3343 | Australia | 1969 |
| PL 28 | Harlow Wilcox And The Oakies | Groovy Grubworm (7", Single, Promo, Yel) | Plantation Records | PL 28 | US | Unknown |
| PLA 28 | Harlow Wilcox & The Oakies* | Groovy Grubworm (7", Single) | Plantation Records | PLA 28 | US | 1969 |
| 68-002 | Harlow Wilcox | Groovy Grubworm / Sad Is The Lonely (7", Single, Mono) | Impel | 68-002 | US | 1969 |
