[INNOVATORS]. A group of 4 manuscripts, comprising:

MARCONI, Guglielmo (1874-1937). Autograph note signed ("Marconi"), in Italian, to his son Giulio. London, n.d. 1 page, oblong 12mo, on Savoy Hotel notepaper, pinholes upper right corner. Marconi writes to his son Giulio at the Royal Naval Academy in Livorno: "A thousand thanks and embraces." -- OLMSTED, Frederick Law (1822-1903). Autograph letter signed ("Fred. Law Olmsted"), to Mrs. Vincenzo Botta. New York city, n.d. 1 page, 8vo, mounting strip left margin, normal age-toning. "I am truly sorry that I can not accept your invitation to breakfast tomorrow…" -- VON BRAUN, Wernher (1912-1977). Autograph mathematical equation and diagram in pencil on place card. N.p., n.d. 1 page, small 16mo (63 x 89 mm). Formula to determine the velocity of flight necessary to send a vessel to space to float in the Earth's orbit, diagram on verso. [With:] Clipped signature on the back of Frederick S. Blackall Jr.'s business card.

Property from the Robert L. McKay Collection, North Tustin, California

Property from the Robert L. McKay Collection, North Tustin, California

Property from the Robert L. McKay Collection, North Tustin, California

[INNOVATORS]. A group of 4 manuscripts, comprising: