Eternal Silence (sculpture) (English Wikipedia)

Kiefer, Achilles & Vogel (2000:146–147) Kiefer, Charles D.; Achilles, Rolf; Vogel, Neil A. (June 18, 2000). "Graceland Cemetery" (PDF). National Register of Historic Places Registration Form, HAARGIS Database. Illinois Historic Preservation Agency. Archived from the original (PDF) on January 20, 2021. Retrieved October 8, 2011.
Kiefer, Achilles & Vogel (2000:68–69) Kiefer, Charles D.; Achilles, Rolf; Vogel, Neil A. (June 18, 2000). "Graceland Cemetery" (PDF). National Register of Historic Places Registration Form, HAARGIS Database. Illinois Historic Preservation Agency. Archived from the original (PDF) on January 20, 2021. Retrieved October 8, 2011.
Kiefer, Achilles & Vogel (2000:132) Kiefer, Charles D.; Achilles, Rolf; Vogel, Neil A. (June 18, 2000). "Graceland Cemetery" (PDF). National Register of Historic Places Registration Form, HAARGIS Database. Illinois Historic Preservation Agency. Archived from the original (PDF) on January 20, 2021. Retrieved October 8, 2011.

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Kiefer, Achilles & Vogel (2000:146–147) Kiefer, Charles D.; Achilles, Rolf; Vogel, Neil A. (June 18, 2000). "Graceland Cemetery" (PDF). National Register of Historic Places Registration Form, HAARGIS Database. Illinois Historic Preservation Agency. Archived from the original (PDF) on January 20, 2021. Retrieved October 8, 2011.
Kiefer, Achilles & Vogel (2000:68–69) Kiefer, Charles D.; Achilles, Rolf; Vogel, Neil A. (June 18, 2000). "Graceland Cemetery" (PDF). National Register of Historic Places Registration Form, HAARGIS Database. Illinois Historic Preservation Agency. Archived from the original (PDF) on January 20, 2021. Retrieved October 8, 2011.
Kiefer, Achilles & Vogel (2000:132) Kiefer, Charles D.; Achilles, Rolf; Vogel, Neil A. (June 18, 2000). "Graceland Cemetery" (PDF). National Register of Historic Places Registration Form, HAARGIS Database. Illinois Historic Preservation Agency. Archived from the original (PDF) on January 20, 2021. Retrieved October 8, 2011.