This is a lot of 4 encyclopaedias, titled "The New Encyclopaedia Britannica in 30 Volumes" published in 1974 by Encyclopaedia Britannica, Inc. These are "macropaedias" that present in-depth knowledge.
Volume 16: Rubens - Somalia
Volume 17: Sonar - Tax Law
Volume 18: Taylor - Utah
Volume 19: Utilitarianism - Zwingli
They are all hardcover copies; printed in the United States.
They come in good pre-owned condition - No writing in books and little to no wear to covers and spines.