The Rover Boys on Treasure Isle Part 50

By FRANKLIN W. DIXON

Ill.u.s.trated. Each Volume Complete in Itself.

No subject has so thoroughly caught the imagination of young America as aviation. This series has been inspired by recent daring feats of the air, and is dedicated to Lindbergh, Byrd, Chamberlin and other heroes of the skies.

OVER THE OCEAN TO PARIS; _or, Ted Scott's Daring Long Distance Flight._

RESCUED IN THE CLOUDS; _or, Ted Scott, Hero of the Air._

OVER THE ROCKIES WITH THE AIR MAIL; _or, Ted Scott Lost in the Wilderness._

FIRST STOP HONOLULU; _or, Ted Scott Over the Pacific._

THE SEARCH FOR THE LOST FLYERS; _or, Ted Scott Over the West Indies._

SOUTH OF THE RIO GRANDE; _or, Ted Scott On a Secret Mission._

ACROSS THE PACIFIC; _or, Ted Scott's Hop to Australia._

THE LONE EAGLE OF THE BORDER; _or, Ted Scott and the Diamond Smugglers._

FLYING AGAINST TIME; _or, Breaking the Ocean to Ocean Record._

OVER THE JUNGLE TRAILS; _or, Ted Scott and the Missing Explorers._

LOST AT THE SOUTH POLE; _or, Ted Scott in Blizzard Land._

THROUGH THE AIR TO ALASKA; or, Ted Scott's Search in Nugget Valley.

FLYING TO THE RESCUE; _or, Ted Scott and the Big Dirigible._

DANGER TRAILS OF THE SKY; _or, Ted Scott's Great Mountain Climb._

FOLLOWING THE SUN SHADOW; _or, Ted Scott and the Great Eclipse._

BATTLING THE WIND; _or, Ted Scott Flying Around Cape Horn._

GROSSET & DUNLAP, PUBLISHERS, NEW YORK

HAL KEEN MYSTERY STORIES

By HUGH LLOYD

Boys! Meet Hal Keen, that lanky, nonchalant, redheaded youth whose guiding star is the star that points to adventure, excitement and mystery. Follow him in his hunts for clues and criminals. There are plenty of thrills and s.h.i.+vers in these stories to keep you on your toes.

THE SMUGGLER'S SECRET

Hal Keen sets out to get to the bottom of a mystery that threatens the safety of a whole community.

THE MYSTERIOUS ARAB

Mystery, excitement, murder in a scientist's camp in the jungles of Africa, where hate, revenge, and suspicion lead to tragedy.

THE HERMIT OF GORDON'S CREEK

The disappearance of two airmail pilots leads to a mystery that centers about an abandoned mine and a strange old man.

KIDNAPPED IN THE JUNGLE

A hint of buried treasure in the ruins of an old French mission leads Hal deep into the Central American jungle.

THE COPPERHEAD TRAIL MYSTERY

Baffling and blood-curdling events center about the ranch where Hal Keen and his friends had gone in search of gold.

THE LONESOME SWAMP MYSTERY

The lonely and mysterious swamp gave up its secret only after a series of terrifying events taxed Hal's courage and ability.

THE CLUE AT SKELETON ROCKS

In this new thriller Hal Keen finds mystery and adventure in and about a lonely lighthouse on Skeleton Rocks, off the Maine coast.

THE DOOM OF STARK HOUSE

Mystery and terror in an old house in the wilderness above Quebec where Hal Keen is the guest of a strange family.

GROSSET & DUNLAP, PUBLISHERS, NEW YORK

THE AVIATION SERIES

By JOHN PRENTICE LANGLEY