Aliens & UFOS.

Disasters : 21 true stories of death and destruction, with exercises for developing readling comprehension and critical thinking skills

Eccentrics : 21 Stories of unusual and remarkable people- with excercises for developing critical reading skills.

Deceptions : 21 fascinating stories of trickery and fraud - with exercises for developing critical reading skills

Phenomena : 21 extraordinary stories- with exercises for developing reading comprehension and critical reading skills / Henry Billings and Melissa Billings

Daredevils : 21 stories of extraordinary daring- with excercises for developing reading comprehension and critical thinking skills / Henry Billings, Melissa Billings.

Rescued : 21 stories of daring rescues- with exercises for developing reading comprehension and critical thinking skills / Henry Billings and Melissa Billings.

Apparitions : 21 stories of ghosts, spirits and mysterious manifestations- with excercises for developing reading comprehension and critical thinking skills / Henry Billings, Melissa Billings, John F. Warner, Margaret B. Warner.

Heroes : 21 true stories of courage and honor--with exercises for developing readling comprehension and critical thinking skills

Eureka! : 21 stories of momentous discoveries and inventions-- with exercises for developing reading comprehension and critical thinking skills

Calamities : 21 stories of disasters that touched the world--with exercises for developing reading comprehension and critical thinking skills