Descriptive of this puzzle's grid - Answers with 15 Letters

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Rectangular array that's identical when its rows and columns are transposed, as this puzzle's grid
It's entirely represented in this puzzle grid
Numerical puzzle with a 9x9 grid
Using both sides with equal frequency (like the letters in this puzzle's answer grid?)
Anti-abuse org. [To see the original color version of this puzzle's unusual grid, visit sundaycrosswords.com.]
Theme of this puzzle, whose members are hidden throughout the grid
First word across in the first-ever crossword (1913) and the first of a dozen appearances of the word in this puzzle's grid, written word search-style (left, right, down, and diagonally) ... Can you f
Web concerns ... and based on six familiar names hidden in rows 1, 4, 12 and 15 of this puzzle grid, what the black squares in those rows symbolize
Classic Belushi comedy, or an apt description of this puzzle's grid?
What you can find in the grid after completing this puzzle, looking up, down, left, right and diagonally, word search-style
Urban areas (as hinted at by the circled letters in this puzzle's grid)
Theme of this puzzle, seen seven times in the grid
Legend born 4/24/1942 whose name's 9 letters are the only ones in this puzzle grid
Number of F's in this puzzle's answer grid
Paper puzzle usually involving a 9x9 grid (2004)
Descriptive of 10 answers in this puzzle
Set of which all seven elements are fittingly hidden in the solved puzzle grid
Award won by lead actors in this puzzle's starred films: the winners' names are hidden "word search"-style in the grid (across, down or diagonally, and forward or backward)
Landmark inaugurated 3/31/1889 whose shape is suggested by nine squares in this puzzle's completed grid
Number of Qs in this puzzle's grid
God with a weekday named after him who can be found in this puzzle's three grid-spanning entries
Result of not following through (of which there are four examples in this puzzle's grid)
Word appearing eight times in this puzzle grid
Puzzle theme which appears nine more times in the grid
Unlike this puzzle's grid