| Description | 1 folder containing correspondence:
1 letter to T G Howarth from E J Nieuwenhuis, Rotterdam
1 letter to T G Howarth from A Diakonoff, Rijksmuseum van Natuurlijke Histoire with 1 reply
1 letter to E J Nieuwenhuis, Rotterdam from T G Howarth
1 letter to E Eisner from T G Howarth with 1 reply
1 folder containing Parnassius Group lists
1 folder containing Lepidoptera lists |