Dictionary of Mythology Folklore and Symbols

My introduction to ancient knowledge came by way of accident. I had picked up Gertrude Jobes Dictionary of Mythology Folklore and Symbols at my local library bookstore for $2.00. It opened up a whole new world to me that has left me fascinated and thirsting for more. To learn about the various gods and the ancients practices and knowledge has helped me greatly in my spiritual journey. I have found Parts 1 and 3 on the internet for a very handsome price. Because of the high price, it has prompted me to learn more about the life of Gertrude Jobes. Is anyone here familiar with Gertrude Jobes, her life, other books, accomplishments and why her 3 part dictionary commands such a high price?