This is a lot of 5 encyclopedias titled "The New Encyclopaedia Britannica in 30 Volumes" published in 1974 by Encyclopaedia Britannica, Inc. These are "macropaedias" which present in-depth knowledge.
Volume 6: Earth - Everglades
Volume 7: Evidence - Georgian S.S.R.
Volume 8: Geraniales - Hume
Volume 9: Humanity - Ivory
Volume 10: Jackson - Livestock.
These leather-bound books were printed in the United States.
They come in good pre-owned condition; No writing in books and little to no wear top covers and spines.