It was released as part of the Tale Spinners for Children series.

Lerner's sister asked him to publish her stories about childhood diseases, which became the Medical Books for Children series (1959).

It is the sequel to The Mammoth Hunters and fourth in the Earth's Children series.

The Plains of Passage is one of the longer books in the Earth's Children series.

It is part one of the Destiny's Children series, and is the first in the reading order for the Xeelee series.

It is the sequel to The Valley of Horses and third in the Earth's Children series.

It is the fourth and final book in Stephen Baxter's Destiny's Children series.

Elements of this appear in his future histories (especially later works like the Destiny's Children series and Flood/Ark), but here it is the focus.

It is part two of the Destiny's Children series.

Her books which form the "Helping Children with Feelings" series are used as key therapeutic tools by child professionals.