| RefNo | Title | Source |
| DF/TM/1/47/19 | Correspondence W: Williams; Wilson; Witherby | |
| DF/TM/1/31/17 | Correspondence W: Wilson; Winslow Cycling Club; Witherby; Henry Wood & Company | |
| DF/ZOO/235/1/1/8/260 | Witherby, Harry. Forbes & Co. | |
| DF/ZOO/232/6/9/17/11 | Witherby, H.F. | |
| DF/ZOO/236/6/140 | External Correspondence (Mollusca and Birds): Witherby, Antony | |
| DF/ZOO/200/51/493-500 | Witherby, Harry F | |
| DF/ZOO/230/4/407 | Witherby, [H F] | |
| DF/TM/1/17/11 | Correspondence W: Wills; Williams & Son; Wingate & Johnston; Witherby | |
| DF/TM/1/53/26 | Correspondence W: Witherby | |
| DF/ZOO/200/51/238-244 | Witherby, Harry F | |
| DF/ZOO/235/1/1/1/845 | Witherby, H F | |
| DF/TR/1/1/26/599 | Witherby, Harry [Forbes] | |
| DF/TR/1/1/27/610 | Witherby, Harry [Forbes] | |
| DF/TM/1/163 | Oversize correspondence: including Hartert; Forest; Harris; Stresemann | |
| DF/TR/1/1/24/500 | Witherby, Harry F | |
| DF/TR/1/1/34/567 | Witherby, [Harry] [Forbes] | |
| DF/ADM/1004/240 | Miscellaneous collections | |
| DF/TM/3/11/59/3 | Mavromoustakis | |
| DF/TM/1/24/15 | Correspondence W: Wilson & Furness-Leyland Line Ltd; Wilson; Wishart; Witherby | |
| DF/TM/1/68/6 | Correspondence W: Wheatley; White; Wiestenberg; Wilkinson; Williams; Williams & Son; Wilson; Witherby; Witwe | |
| DF/TR/1/1/25/492 | Witherby, Harry F | |
| DF/TR/1/1/28/638 | Witherby, [Harry] [Forbes] | |
| DF/TR/1/1/29/679 | Witherby, [Harry] [Forbes] | |
| DF/TR/1/1/30/586 | Witherby, [Harry] [Forbes] | |
| DF/TR/1/1/31/665 | Witherby, [Harry] [Forbes] | |
| DF/TR/1/1/32/559 | Witherby, [Harry] [Forbes] | |
| DF/TR/1/1/33/614 | Witherby, [Harry] [Forbes] | |
| DF/TM/1/60/17 | Correspondence W: Winton; Witherby | |