The Coconut Killings, by Patricia Moyes (Penguin, $1.95). Another adventure for that congenial, middle-aged sleuthing couple, Scotland Yard Chief Superintendent Henry Tibbett and his wife Emmy. This case takes them to a Caribbean isle where an American senator has been murdered on a golf course.

A River Runs Through It, by Norman Maclean (Phoenix/Chicago, $3.95). A beautifully written story of two brothers, a father, and their passion for fly fishing.

The Audubon Society Field Guide to North American Rocks and Minerals, by Charles W. Chesterman (Knopf, $9.95). A detailed handbook, replete with color illustrations and descriptive keys, for anyone wishing to identify minerals.

Pariswalks, by Alison and Sonia Landes (New Republic Books, $5.95). A quintet of exceedingly pleasant sounding strolling tours - four left Bank neighborhoods and another on the Right - which highlights cafes, shops, hotels, and all manner of nooks and crannies which the authors deem worth a look or a stop.

Scream in a Cave, by Edwin Denby (Popular Library, $1.95). The famous dance critic's only novel: the sun-drenched island of Mallorca and a search for lost diamonds provides the backdrops for romance between a beautiful American woman and a Spanish aristocrat.

Some Came Running; The Pistol; Go to the Widow-Maker; Whistle; by James Jones (Dell, $2.75; $2.25; $2.75; $2.75).Four novels of men caught up in destruction by the author of From Here to Eternity .

The River Congo, by Peter Forbath (Dutton, $7.95). A history of the exploration and singular beauties of the great African river.

Spy Story, by Len Deighton (Pocket, $2.25). Agent Harry Palmer, the anti-hero of The Ipcress File , returns for another shadowy battle of wits and double-crossings.

Transatlantic Blues, by Wilfred Sheed (Avon, $2.25). Stylish TV personality Monty Chatworth confesses his past sins of commission and omission to his tape recorder, Father Sony.

Saint Jack, by Paul Theroux (Ballantine, $1.95). Jack Flowers, who runs a brothel, recalls the highlights and lowlife of Singapore society.

Ascent, by Jeremy Bernstein (Bison, $2.95). The history of how man has conquered mountains, his daring, his techniques, and his equipment, from the pen of a physicist and amateur alpinist.

Nature Is Your Guide, by Harold Gatty (Penguin, $3.95). If you get stuck on a desert isle or a glacial field in a snowstorm, be sure you have Gatty's book, which is full of information on nature's directional signposts - stars wind patterns on ice, sea bird habits, and much more.

The Brendan Voyage, by Tim Severin (Avon, $2.75). Severin sailed across the north Atlantic in a leather boat to recreate and prove the possibility of a voyage by Irishmen who discovered America first.

And Having Writ . . ., by Donald R. Bensen (Ace, $1.95). A group of aliens, who have crashed on earth during the early 20th century, encounter Teddy Roosevelt, Edison, and H.G. Wells as they try to advance earth's technology so that their spaceship can be rebuilt.

Injury Time, by Beryl Bainbridge (Bantam, $2.25). Satire on a pair of middle-aged lovers and their lives in contemporary England.

Sacajawea, by Anna Lee Waldo (Avon, $8.95). The Indian woman who guided the Lewis and Clark expedition remembers her past filled with adventure and love.

Long Time No See, by Ed McBain (Bantam, $1.95). The latest 87th Precinct procedural takes Detectives Carella and Meyer after the murderer of a blind couple.

Mother's Day, by Robert Miner (Pocket, $1.95). The serio-comic experiences of an abandoned husband trying to cope with the joys of motherhood - two small children.