The Secret Language of Birthdays by G. Goldschneider & J. Elffers (1994 HCDJ) is a vintage hardcover book that serves as a comprehensive guide to understanding the meaning behind each day of the year. Focusing on numerology, personality traits, and astrology, the book provides insights into the significance of birthdays and how they influence our lives. With illustrations and 832 pages of content, this reference book is a valuable resource for those interested in psychology, the body, mind & spirit, and general personality interpretation. Perfect for anyone looking to delve deeper into the secrets of their birthdate.