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Thud and Blunder learn what not to do while in a coal mine.
Sniffy Escapes Poisoning
1967
Health for the Americas: The Unseen Enemy
1945
The Winged Scourge
1943
Defense Against Invasion
Out of the Frying Pan Into the Firing Line
1942
Health for the Americas: Planning for Good Eating
1946
The Grain That Built a Hemisphere
The New Spirit
Blue Sticks
1998
Grain Harvest
1944
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