Top 50 /r/PrintSF

I've made a table for you with the year of publication and ISBN:

| Rank | Votes | Title | Author | Year | ISBN |
|------|-------|-------|--------|------|------|
| 1 | 449 | The Dispossessed (Hainish Cycle #6) | Ursula K. Le Guin | 1974 | 978-0061054884 |
| 2 | 297 | Dune (Dune #1) | Frank Herbert | 1965 | 978-0441013593 |
| 3 | 262 | Hyperion (Hyperion Cantos #1) | Dan Simmons | 1989 | 978-0553283686 |
| 4 | 196 | Book of the New Sun | Gene Wolfe | 1980 | 978-0312890186 |
| 5 | 185 | House of Suns | Alastair Reynolds | 2008 | 978-0441016259 |
| 6 | 182 | Children of Time (Children of Time #1) | Adrian Tchaikovsky | 2015 | 978-0316452502 |
| 7 | 180 | Use of Weapons (Culture #3) | Iain M. Banks | 1990 | 978-0316005401 |
| 8 | 176 | Spin (Spin #1) | Robert Charles Wilson | 2005 | 978-0765348258 |
| 9 | 171 | The Hitchhiker's Guide to the Galaxy (The Hitchhiker's Guide to the Galaxy #1) | Douglas Adams | 1979 | 978-0345391803 |
| 10 | 165 | The Stars My Destination | Alfred Bester | 1956 | 978-0679767800 |
| 11 | 163 | Neuromancer (Sprawl #1) | William Gibson | 1984 | 978-0441569595 |
| 12 | 147 | Ender's Game (Ender's Saga #1) | Orson Scott Card | 1985 | 978-0812550702 |
| 13 | 129 | A Deepness in the Sky (Zones of Thought #2) | Vernor Vinge | 1999 | 978-0812536355 |
| 14 | 127 | Diaspora | Greg Egan | 1997 | 978-0061056499 |
| 15 | 117 | The Moon is a Harsh Mistress | Robert A. Heinlein | 1966 | 978-0312863551 |
| 16 | 109 | Anathem | Neal Stephenson | 2008 | 978-0061474095 |
| 17 | 105 | Dawn (Xenogenesis #1) | Octavia E. Butler | 1987 | 978-0446603775 |
| 18 | 98 | Cat's Cradle | Kurt Vonnegut | 1963 | 978-0385333481 |
| 19 | 95 | Lord of Light | Roger Zelazny | 1967 | 978-0060567231 |
| 20 | 93 | The Left Hand of Darkness (Hainish Cycle #4) | Ursula K. Le Guin | 1969 | 978-0441478125 |
| 21 | 82 | Have Space Suit - Will Travel | Robert A. Heinlein | 1958 | 978-0345324405 |
| 22 | 73 | Childhood's End | Arthur C. Clarke | 1953 | 978-0345347954 |
| 23 | 67 | The Forever War (The Forever War #1) | Joe Haldeman | 1974 | 978-0312536633 |
| 24 | 65 | The Diamond Age | Neal Stephenson | 1995 | 978-0553380965 |
| 24 | 65 | Ancillary Justice (Imperial Radch #1) | Ann Leckie | 2013 | 978-0316246620 |
| 25 | 64 | The Mote in God's Eye (Moties #1) | Larry Niven & Jerry Pournelle | 1974 | 978-0671741921 |
| 26 | 63 | The Sparrow (The Sparrow #1) | Mary Doria Russell | 1996 | 978-0449912553 |
| 27 | 60 | Jurassic Park | Michael Crichton | 1990 | 978-0345538987 |
| 28 | 56 | Snow Crash | Neal Stephenson | 1992 | 978-0553380958 |
| 29 | 50 | A Fire Upon the Deep (Zones of Thought #1) | Vernor Vinge | 1992 | 978-0812515282 |
| 29 | 50 | Flowers for Algernon | Daniel Keyes | 1966 | 978-0156030304 |
| 30 | 48 | Do Androids Dream of Electric Sheep? | Philip K. Dick | 1968 | 978-0345404473 |
| 31 | 38 | Speaker for the Dead (Ender's Saga #2) | Orson Scott Card | 1986 | 978-0812550757 |
| 32 | 37 | 2312 | Kim Stanley Robinson | 2012 | 978-0316098120 |
| 33 | 33 | Earth Abides | George R. Stewart | 1949 | 978-0449212004 |
| 34 | 29 | The Quantum Thief (Jean Le Flambeur #1) | Hannu Rajaniemi | 2010 | 978-0765367686 |
| 34 | 29 | A Scanner Darkly | Philip K. Dick | 1977 | 978-0547572178 |
| 35 | 26 | God Emperor of Dune (Dune #4) | Frank Herbert | 1981 | 978-0441294671 |
| 36 | 24 | Stars in My Pocket Like Grains of Sand | Samuel R. Delany | 1984 | 978-0553262902 |
| 37 | 23 | Foundation (Foundation #1) | Isaac Asimov | 1951 | 978-0553293357 |
| 38 | 20 | Accelerando | Charles Stross | 2005 | 978-0441014156 |
| 39 | 18 | Star Maker | Olaf Stapledon | 1937 | 978-0486211671 |
| 40 | 17 | The Last Question | Isaac Asimov | 1956 | N/A (Short Story) |
| 40 | 17 | Aurora | Kim Stanley Robinson | 2015 | 978-0316098090 |
| 40 | 17 | Roadside Picnic | Arkady & Boris Strugatsky | 1972 | 978-1613743416 |
| 40 | 17 | Stranger in a Strange Land | Robert A. Heinlein | 1961 | 978-0441788385 |
| 41 | 16 | The Sirens of Titan | Kurt Vonnegut | 1959 | 978-0385333498 |
| 41 | 16 | Excession (Culture #5) | Iain M. Banks | 1996 | 978-0553575378 |
| 42 | 14 | Ubik | Philip K. Dick | 1969 | 978-0547572298 |
| 42 | 14 | Schismatrix Plus | Bruce Sterling | 1985 | 978-0441003679 |
| 43 | 13 | More Than Human | Theodore Sturgeon | 1953 | 978-0375703638 |
| 44 | 12 | The Dark Forest (Remembrance of Earth's Past #2) | Cixin Liu | 2008 | 978-0765377081 |
| 45 | 11 | Altered Carbon (Takeshi Kovacs #1) | Richard K. Morgan | 2002 | 978-0345457684 |
| 45 | 11 | Project Hail Mary | Andy Weir | 2021 | 978-0593135204 |
| 46 | 10 | The Martian Chronicles | Ray Bradbury | 1950 | 978-0553278224 |
| 47 | 9 | Look to Windward (Culture #7) | Iain M. Banks | 2000 | 978-0743421928 |
| 47 | 9 | Solaris | Stanisław Lem | 1961 | 978-0156837507 |
| 47 | 9 | Startide Rising (Uplift Saga #2) | David Brin | 1983 | 978-0553274189 |
| 47 | 9 | Ringworld (Ringworld #1) | Larry Niven | 1970 | 978-0345333926 |
| 48 | 8 | Permutation City | Greg Egan | 1994 | 978-0061054815 |
| 48 | 8 | The Gone World | Tom Sweterlitsch | 2018 | 978-0399563829 |
| 48 | 8 | Dying Inside | Robert Silverberg | 1972 | 978-0553024234 |
| 49 | 7 | 2001: A Space Odyssey (Space Odyssey #1) | Arthur C. Clarke | 1968 | 978-0451457998 |
| 49 | 7 | 1984 | George Orwell | 1949 | 978-0452284234 |
| 49 | 7 | Rendezvous with Rama (Rama #1) | Arthur C. Clarke | 1973 | 978-0553287899 |
| 49 | 7 | Ready Player One (Ready Player One #1) | Ernest Cline | 2011 | 978-0307887443 |
| 50 | 6 | Consider Phlebas (Culture #1) | Iain M. Banks | 1987 | 978-0316005425 |