36599
Writings and research Correspondence was one of the primary ways in which Pitman conducted his zoological , herpetological , and ornithological research , as he relied almost solely on his own observations or the first-hand observations of others for data .
 Pitman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pitman