Answer:

ccc

Answer	Crossword Clue
CCC	New Deal prog.
CCC	New Deal agcy.
CCC	Perfect score at Colosseum lanes?

CCC	New Deal monogram
CCC	New Deal org. concerned with natural resources
CCC	Three hundos, in Roman numerals
CCC	New Deal org.
CCC	Old tree-planting org.
CCC	XXX times X
CCC	VI x L
CCC	Roosevelt's "Tree Army," for short

CCC	Junk-bond rating
CCC	V x LX
CCC	XV x XX
CCC	L x VI
CCC	Brutus' 300
CCC	300, to Caesar
CCC	Last year of the 3rd century
CCC	XII strikes?

CCC	Perfect score at Colosseum Lanes?
CCC	Caesar's perfect bowling score?
CCC	300, to Cato
CCC	300, to Tiberius
CCC	Poor bond rating
CCC	Caesar's perfect bowling score
CCC	XXX x X
CCC	300 in old Rome

CCC	Caesar's 300
CCC	Junk bond rating
CCC	LX quintupled
CCC	Perfect bowling game for Caesar?
CCC	X x XXX
CCC	FDR innovation
CCC	Year in St. Marcellinus' reign
CCC	Speculative bond rating

CCC	FDR program
CCC	FDR's tree-planting agcy.
CCC	VI times L
CCC	Perfect game at Rome Roll-a-rama?
CCC	L times VI