Fourth Construction

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The first mention of this work is in David Revill's book 'the Roaring Silence'. According to Revill this is an unfinished composition from around 1942.
Leta Miller's more recent essays 'The Art of Noise' and 'Cultural Intersections: John Cage in Seattle (1938-1940)' come to another conclusion: 'Fourth Construction' is the original title of the work we now know as 'Imaginary Landscape No.2 (March)' (1942). In her essays Miller reverses the title to 'March (Imaginary Landscape No.2)'.

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Sources: David Revill: The Roaring Silence. Page 76; Leta Miller: "The Art of Noise" in 'Perspectives on American Music, 1900-1950' (Michael Saffle, editor); Leta Miller: "Cultural Intersections: John Cage in Seattle (1938-1940)" in 'John Cage - Music, Philosophy, and Intention, 1933-1950' (David W.Patterson, editor)