Sinai
2 of the 7 encyclopedias on this shelf carry an entry for Sinai. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
a mountain, or mountain range in Arabia Petræa, in the peninsula formed by the two arms of the Red Sea, and rendered memorable as the spot where, according to the Pentateuch, the law was given to Israel through Moses. This mountain pass is divisible into three groups: a N. W., reaching, in Mount Serbal, an elevation of 6,340 feet; an E. and central, attaining, in Jebel Katherin, a height of 8,160 feet; and a S. E., whose highest peak, Um Shaumer, is the culminating point of the whole Sinaitic range. Serbal, with its five peaks, is the most magnificent mountain in the peninsula, and is identified with Sinai by the earlier Church fathers, fathers, Eusebius, Jerome, Cosmas, etc.; but it does not meet the requirements of the Hebrew narrative, and even as early as the time of Justinian the opinion that Serbal was the Sinai of Moses had been abandoned, and to a ridge of the second or E. range that honor had been transferred, the N. summit of which is termed Horeb; and the S. Jebel Mûsa, or Mount of Moses, continues to be regarded by the great majority of scholars as the true Sinai. Its height is variously estimated at from 6,800 to 7,100 feet above the sea. It is separated from the Jebel-ed-Deir on the W. by a narrow valley, called Er-Rahah, on one of the steps of which stands the famous convent of Mount Sinai, devoted to St. Catherine. In many of the western Sinaitic valleys the more accessible parts of valleys the rocky sides are covered by thousands of inscriptions, usually short, and rudely carved in spots where travelers would naturally stop to rest at noon, frequently accompanied by a cross and mingled with representations of animals. The inscriptions are in unknown characters, but were at first ascribed to the ancient Israelites on their way from Egypt to Sinai, and afterward to Christian pilgrims of the 4th century. Recently, however, many of them have been deciphered by Professor Beer of Leipsic, who regards them as the only known remains of the language and characters once peculiar to the Nabathæans of Arabia Petræa.
Aiton's Encyclopedia (1910)
si'na, or si'ni, a mountain of Arabia. It rises from the peninsula of Sinai, east of the Gulf of Suez. Properly speaking, Sinai is not a mountain but a mountainous region. There are three principal peaks about 8,000 feet in height. Although the Scriptural account speaks of a single peak, at the foot of which half a million men, with women, children, and cattle encamped for ten months, and on which the law was delivered to Moses, it is impossible to identify the exact locality. Much controversy has been wasted over this point in vain. Mount Sinai is composed of primitive rocks, granite, porphyry, gneiss, etc. The Egyptians found emerald, malachite, turquoise, and copper in this region. It was at one time well wooded, but the granite walls are now chiefly bare. After a heavy rain the deep valleys are filled with rushing torrents, but are soon reduced to dry, sandy channels. A few Bedouins inhabit the region, subsisting chiefly on sheep and goats. There are a number of aromatic plants of commercial value. The ibex or mountain goat and the hyena still lurk among the rocks. Large flights of quails alight in seasons of migration. In the early days of Christianity many anchorites or holy hermits, attracted by the sanctity of the region and the prevalence of caverns, made their homes among the rocks and mountains. The region is in dispute between Egypt and Asiatic Turkey.