Lutherans
2 of the 7 encyclopedias on this shelf carry an entry for Lutherans. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
a designation originally applied by their adversaries to the Reformers of the 16th century, and afterward distinctively appropriated among Protestants themselves to those who took part with Martin Luther against the Swiss Reformers, particularly in the controversies regarding the Lord's Supper. It is so employed to this day as the designation of one of the two great sections into which the Protestant Church was soon unhappily divided, the other being known as the REFORMED CHURCH (q. v.). To the end of Luther's life perfect harmony subsisted between him and his friend Melanchthon; but already there were some who stood forth as more Lutheran than Luther, and by whom Melanchthon was denounced as a "crypto-Calvinist" and traitor to a evangelical truth. After Luther's death this party became more confident, and, holding by Luther's words, without having imbibed his spirit, changed his evangelical doctrine into a dry scholasticism and lifeless orthodoxy, while extreme heat and violence against their opponents were substituted in the pulpit itself for the zealous preaching of the Gospel. The principal seat of their strength was in the University of Jena, which was founded in 1557 for this very object, and maintained their cause against Wittenberg. Great intolerance was manifested by this party; and no controversy was ever conducted with more bitterness and ill-feeling than the Sacramentarian Controversy. Lutheranism is the prevailing form
Aiton's Encyclopedia (1910)
the body of Christians that follow the teachings of Martin Luther. The Lutherans call themselves "Evangelical," by way of distinction from the Roman Catholic church and the "reformed" churches, or the followers of Calvin. They form one of the two great divisions that arose during the period of Reformation. The Lutheran is the state religion of many German states, of Sweden, Norway, and Denmark. The Augsburg Confession and Luther's Shorter Catechism contain the decisive principles common to the different bodies of Lutherans. The first Lutherans in America were Dutch settlers of New Amsterdam in 1623. The Swedes who settled on the Delaware in 1637 and the following years were Lutherans. The Lutheran churches are strongest in Pennsylvania and in the North Central States. There are several denominations, including Swedish, Norwegian, German, Danish, Finnish, and Icelandic synods. There are in all about 12,000 congregations and a trifle under 2,000,000 communicants. Numerous colleges and academies are maintained by the various bodies of Lutherans.