Crossword puzzle clue "unknown source informally"

Here are the possible solutions for unknown source informally clue

Answer
Clue
Relevancy
anon
Clue
Unknown source, informally
Unknown quote source, for short
Source unknown, as a quote: Abbr.
Abbreviation for a quote whose source is unknown
Definition
at once; immediately, also ANAN
agod
Clue
Steinbeck's "To ___ Unknown"
"To ___ Unknown" (Steinbeck novel)
alg
Clue
Search for the unknown?: Abbr.
algebra
Clue
Search for the unknown?
Definition
(Arabic) a method of calculating by symbols

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