Earl W. Thomas

• A Grammar of Spoken Brazilian Portuguese
• Mystery of the Pirates' Treasure
• The Syntax of Spoken Brazilian Portuguese
• The Syntax of Spoken Brazilian Portuguese
• Flying Circus (Unusual Events)
• Mystery of the Pirates' Treasure (Unusual Events)
• Mystery of the Strange Creature (Unusual Events)
• Secret of the Devil's Triangle (Unusual Events)
• Secret of the Unknown Ghost (Unusual Events)
• Unusual Events Series