Combined forces of the two famous dinosaur experts Donald F. Glut and Don Lessem, resulted with the detailed listing and description of all dinosaur genera and species known at the time of the publishing (1994). The encyclopedia contains 400 original illustrations of fossils, skeleton reconstructions and life retorations. It is a pitty thourg, that all the dinosaur described in the book were not accompanied with their illustrations. Nevertheless, it is a great reference book and recommended for all ages