Crossword puzzle clue "how john d rockefeller earned his money"

Here are the possible solutions for how john d rockefeller earned his money clue

Answer
Clue
Relevancy
oil
Clue
How John D. Rockefeller earned his money
Source of Rockefeller money
Definition
to lubricate with a greasy substance
nine
Clue
Earned run average times innings pitched divided by earned runs given up
Definition
the cardinal number above eight
davison
Clue
The "D" of John D. Rockefeller
oilbarons
Clue
John D. Rockefeller and others
oilman
Clue
John D. Rockefeller, for one
Definition
one who owns or operates an oil well
oiltycoons
Clue
John D. Rockefeller and J. Paul Getty
standardoil
Clue
John D. Rockefeller's company

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