The Village Voice 1969/?, str. ?: Theatre: The Increased Difficulty of Concentration
- Document's type: Press cutting / Review
- Author: Martin Washburn (Author)
- Date of origin: 11. 12. 1969
- Record's ID: 10072
The Fordham Ram 1969/?, str. ?: 'Concentration': man united in a death grip
- Document's type: Press cutting / Review
- Author: George Whitman (Author)
- Date of origin: 5. 12. 1969
- Record's ID: 10070
Variety 1969/?, str. ?: Off-Broadway Reviews. The Increased Difficulty of Concentration
- Document's type: Press cutting / Review
- Date of origin: 17. 12. 1969
- Record's ID: 10076
The Jersey Journal 1969/?, str. ?: Four Women Cause Him 'Trouble Concentrating'
- Document's type: Press cutting / Review
- Author: Eugene C. Flinn (Author)
- Date of origin: 5. 12. 1969
- Record's ID: 10068
The Record 1969/?, str. ?: 'Concentration' Is A Mind-Blowing Farce
- Document's type: Press cutting / Review
- Author: Emory Lewis (Author)
- Date of origin: 5. 12. 1969
- Record's ID: 10067
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