It's a shame to see books like this go out of print. It is subtitled "Famous Women Gardeners". Hollingsworth is a great story teller and in this book offers essays on twenty women (two Englishwomen, eighteen American) who contributed to the evolution of gardening, botany and plant research especially in America.
I enjoyed it because not only was there a chapter on much written about Gertrude Jeckyll, but on women I might not otherwise have read about.
Hollingsworth also includes a useful bibliography.
Her book 'Gardening on Main Street' is also recommended.