Final answer:
It is not possible to provide a detailed answer to this question as there is no specific information available about Crowther's research or the Bill Tree campaign.
Step-by-step explanation:
The question is asking about how Crowther's research affected the Bill Tree campaign. However, there is no specific information available about a researcher named Crowther or a campaign called the Bill Tree campaign. Therefore, it is not possible to provide a detailed answer to this question.