. . "Sketches" . "Juvenile works" . . . "Corrected typescripts, corrected galley proofs, page proof, corrected page proofs, corrected page proof with ink & pencil sketches." . . . . "Manuscripts for publication" . . "Explains chemicals, elements, chains and rings, radioactivity, and many other aspects of atoms and molecules." . . . . "Atoms and molecules" . . "Explains chemicals, elements, chains, and rings, radioactivity, and many other aspects of atoms and molecules." . . . . . .