When was the Encyclopædia Britannica first published in a 'Junior' edition?

The Encyclopædia Britannica (Latin for "British Encyclopaedia"), published by Encyclopædia Britannica, Inc., is a general knowledge English-language encyclopaedia. It is written by about 100 full-time editors and more than 4,000 contributors, who have included 110 Nobel Prize winners and five American presidents. The 2010 version of the 15th edition, which spans 32 volumes and 32,640 pages, was the last printed edition; digital content and distribution has continued since then.

The Britannica is the oldest English-language encyclopaedia still in production. It was first published between 1768 and 1771 in the Scottish capital of Edinburgh, as three volumes.

Britannica Junior was first published in 1934 as 12 volumes.

It was expanded to 15 volumes in 1947, and renamed Britannica Junior Encyclopædia in 1963.

It was taken off the market after the 1984 printing.

A British Children's Britannica edited by John Armitage was issued in London in 1960. Its contents were determined largely by the eleven-plus standardized tests given in Britain. Britannica introduced the Children's Britannica to the US market in 1988, aimed at ages seven to 14.

In 1961 a 16 volume Young Children's Encyclopaedia was issued for children just learning to read.