Book 1: BLUE JOHN’S CAVERN Traveling through caves, jumping through time. Nothing interesting ever happens in Diamond Falls, West Virginia, and that's doubly true for local teenagers Emma and Brody. Little do they know that their neighbor, a famous geologist, is about to show them the wildest time of their lives. When Mr. M's prized rock and mineral collection is destroyed before it can be displayed at the state museum, Emma and Brody jump at the chance to find new samples. The geologist accepts the offer, and promptly sends them back to the year 1775 to help! Back in time and across the pond in Derbyshire, England, Emma and Brody team with a mysterious young girl named Max to recover one of the rarest minerals in the world: Blue John Fluorite. Tapping into courage they never knew they had, the formerly ordinary West Virginians must protect a cave, avoid gun-toting soldiers, and return to the present before they're trapped forever. Book 2: RUSHER’S GOLD A time-traveling cave. A vicious band of miners…and pure gold. After a successful trip to 1775 England where they collected the rare Blue John Fluorite, Emma and Brody are quick to jump at the chance to travel to the California Gold Rush in 1851. When they arrive at the Gold Rush and meet an old acquaintance, they think the mission will be easy until they realize their friend may not be able to help them at all. When their actions in the past erase their future, can Emma and Brody right the wrong? With a hostile group of miners hot on their trail, Brody and Emma must collect the gold, save their friends, and salvage the future before it is too late. Book 3: BLACK’S OPAL Determined to find the perfect Black Opal, Emma and Brody with the help of Mr. M’s granddaughter, travel to Lightning Ridge, Australia in 1925. As they navigate a herd of stampeding kangaroo, goat cart races, and flying boomerangs, the kids meet Rose, a young girl whose mysterious secret will rock their world forever. When their attempts to collect the perfect opal anger the locals, the kids flee and accidentally land over 2000 years in the future in South Carolina. Can the kids figure out how to return to their own state and time? Will Rose’s secret stop them from helping Mr. M? Will Max finally figure out who destroyed her Grandfather’s prized rock and mineral collection and why? The answers are all inside but may leave you with a new mystery to solve. Book 4: EGERAN’S MOUNTAIN Teenagers Emma and Brody are at it again as they jump into the magical Crystal Cave and land in Italy in the year 2050 to collect a rare mineral from the top of the world’s most dangerous volcano. Little do they know that the typically quiet Mount Vesuvius is just about to roar to life for the first time in over 100 years. When Rose sneaks to the future and finds that Emma and Brody are in grave danger, she races to find Max and asks her to help save their friends. As Emma and Brody team with a group of college students to climb up the crater’s summit over 300 feet in the air to collect the prized samples, they must risk their lives to save their friends when a terrible rockslide turns into the nightmare of a full volcanic eruption. Will Rose and Max arrive in time to save Emma, Brody, and their best friend, Aspen? Will the secret of the crystal cave be lost forever? And, why did a simple rock and mineral collection put so many lives in jeopardy? As the mystery of who destroyed Mr. M’s rock and mineral collection is solved, Max is shocked to learn the reason why and more determined than ever to save her friends…and her family. If you like a little excitement thrown in with your science, then you'll love Tracy Diane's fast-paced and exciting series, the Crystal Cave Adventures. Join the adventure today!

This work is the only comprehensive guide to sequels in English, with over 84,000 works by 12,500 authors in 17,000 sequences.

Includes Part 1, Books, Group 1 (1946)

Entries includes critical commentary, brief biographical information, a portrait when available, a list of principal works, and may also include a further reading section about creative writers in the young adult genre.

Vols. for 1980- issued in three parts: Series, Authors, and Titles.

A comprehensive bibliography of books and short fiction published in the English language.