Opus No. Title Date Setting Publication typesort ascending I.U.C. Notes
90 Down in Flames January, 1969 Known Space Non-Fiction Read It Here! Destruction of Known Space, inspired by a conversation with Norman Spinrad. Never written beyond the outline phase.  Niven started writing Ringworld shortly after instead. Though this saw print in 1969, it appears much further down the list in Niven's published bibliographies.
38 Exercise in Speculation: The Theory and Practice of Teleportation March, 1969 Non-Fiction Discussion of teleportation as personal transportation and even as an interstellar drive.
41 Man of Steel, Woman of Kleenex December, 1969 N/A Non-Fiction Read It Here! Entertaining speculation on Superman's sex life on Earth, including a discussion of how to preserve the Kryptonian race. Often quoted, but almost never illustrated, thanks to DC Comics' legal department.
62 Recipes January, 1973 N/A Non-Fiction From Amazon.com: "Anne McCaffrey's cookbook, featuring real (you can cook them) recipes created by science fiction and fantasy writers such as Harlan Ellison, Ursula K. Le Guin, Avram Davidson and of course Anne McCaffrey herself. Mixed in with the recipes are stories and anecdotes about how they were created - some longer than the recipes!" This classic from 1973 was revised and re-released by Wildside Press in 1992. The included Niven recipes (irish coffee and others) seem to be intended for a bartender rather than a chef, but then that's the role Niven often finds himself performing at conventions.
66 Theory and Practice of Time Travel, The April, 1973 N/A Non-Fiction Speculative
Afterword March, 1973 N/A Non-Fiction A word how the Svetz stories came to be written
72 Bigger Than Worlds March, 1974 N/A Non-Fiction discussion of the Ringworld and other macrostructures. Illustrated by Ames
83 Galaxy Stars: Jerry Pournelle July, 1975 Non-Fiction: The Ghetto Non-Fiction Bio of Jerry Pournelle, with whom Niven had recently published The Mote in God's Eye and Inferno and was hard at work on Lucifer's Hammer.
85 Afterthoughts August, 1975 Known Space: About Non-Fiction "parting thoughts" on Known Space, as if. Shares an "Opus number" with "Timeline for Known Space" in Niven's published bibliographies.
85 Timeline for Known Space August, 1975 Known Space: About Non-Fiction Like the title says. Shares an "Opus number" with "Afterthoughts" in Niven's published bibliographies.
Bibliography: The Worlds of Larry Niven August, 1975 N/A Non-Fiction A broad but incomplete bibliography, helpfully broken out into different categories.
91 Building the Mote in God's Eye January, 1976 Motie Non-Fiction Collaboration, co-written with Jerry Pournelle
89 Afterword: The Last Word about SF Detectives February, 1976 Known Space: Gil Hamilton Non-Fiction Niven speaks candidly about his early attempts to write his "Gil Hamilton" Sci-fi/crime stores, and about some of the predictions that have and haven't come true.
97 Words in Science Fiction, The July, 1976 N/A Non-Fiction Read It Here! essay on writing sci-fi
135 Notebooks of Mack Sikes, The August, 1976 N/A Non-Fiction Read It Here! A tongue-in-cheek poke at some of the classics of 20th-century SF, as imagined by a little-known pulp writer named "Harvey McIlroy Sikes."
117 Future Histories January, 1979 N/A Non-Fiction Special SFWA issue on future histories
110 Shall We Indulge in Rishathra? March, 1979 N/A Non-Fiction With cartoons by William Rotsler. "Rishathra" is a Ringworld ritual.
145 Staying Rich July, 1979 N/A Non-Fiction essay
119 From Macrostructures Engineering: Progress Report January, 1980 N/A Non-Fiction Read It Here! An essay about fandom's reaction to Ringworld, and writing The Ringworld Engineers.
125 Roentgen Standard, The July, 1980 N/A Non-Fiction Read It Here! Printed in Limits as "Yet Another Modest Proposal." Niven's published bibliographies list it as October 1981, but Carol's research indicates it appeared in July 1980

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