Roger nailed it. Tarbell agreed to review Yost's book even though she was without the services of a secretary and under doctor's orders not to strain herself. She had to write in long-hand, which was hard enough, but given her Parkinson's it took a monumental effort.
Some might question the ethics of Tarbell reviewing Yost's book given that they were very close friends. I will leave that to others to determine.
Best
Rob
Abraham Lincoln is the only man, dead or alive, with whom I could have spent five years without one hour of boredom.
--Ida M. Tarbell
I want the respect of intelligent men, but I will choose for myself the intelligent.