Four Day Planet and Lone Star Planet
Classic Science Fiction, alien planets, Hyper-drive space ships, contra-gravity, weird societies. For all that the characters are human and problems (I said Classic Science Fiction) are human problems. Neither of these stories have overlapping characters.

Four Day Planet is about  a young man trying to be a reporter in a small town (the only town) on a back water planet. Oh, by the way, there are only 4 days in this planet's year. The year is about long as ours so as you can guess the conditions are rather extreme just as is the local wild life. As the story progresses we have graft, corruption, attempted murder, revolution, monsters and oh yes lots of guns. Did I mention Piper's universe is full of guns, regular fire arms that any old NRA member would recognize? The characters are well developed and well paced. I have read this one many times and enjoyed again and again.

Lone Star Planet - Pick a planet where the 'New Texans' packed up the Alamo and brought it with them and Piper will show you a planet that out Texas's Texas. Add in a deep streak of Libertarian government ( I think Piper was a Libertarian before the word was invented.) The main character is an Federation (Earth) Diplomat who has been issued a pair speed draw pistols as part of his Diplomatic Uniform and you'll see that is not a diplomatic mission you have ever seen the like of. The locals are ranchers who need armored cars and auto-0cannon to herd the local 'Steers' (big as a Mack truck and twice as mean as a Long Horn.' As usual Piper has good characters and a plot twist towards the end that makes satisfying reading.
In library. Fedation, H Beam Piper, Classic Science Fiction, Fiction, general
H. Beam Piper
Henry Beam Piper was born in Altoona, Pennsylvania, in 1904, and died, an apparent suicide, in Williamsport, Pennsylvania, in 1964.  Piper's first published story, "Time and Time Again" (Astounding Science Fiction, April 1947), was adapted for radio and aired on the NBC program Dimension X on 12 July, 1951, and again on the NBC program X Minus One on 11 January, 1956.  His historical essay "Rebel Raider," published in True: The Men's Magazine in 1950, inspired the fictional teleplay Willie and the Yank, a three-part mini-series which aired on Walt Disney's Wonderful World of Color in January 1967 (and was later released theatrically as Mosby's Marauders).  His first novel was the 1953 mystery Murder in the Gunroom and his science-fiction novel Little Fuzzywas nominated for a Hugo Award in 1963.  Piper made his living working for the Pennsylvania Railroad and was a member of the National Rifle Association (NRA), the New York Authors' Club, and the Hydra Club. 

Piper occasionally attended the annual World Science Fiction Convention, attending the 1957 WorldCon in London with his wife.  He also attended the 1962 WorldCon in Chicago and the 1963 WorldCon in Washington, DC. 

After Piper's death, the intellectual property rights to his fiction were acquired by Ace Books (now an imprint owned by Penguin Random House).  The late author Jerry Pournelle was granted the right by Piper himself (and acknowledged by Ace) to publish stories set in Piper's fictional settings but, despite decades-long rumors of a sequel to Space Viking, apparently decided not to take advantage of this opportunity.  In the early 1980's, Ace commissioned two sequels to Piper's Fuzzy novels, William Tuning's Fuzzy Bones and Ardath Mayhar's Golden Dream: A Fuzzy Odyssey, before Piper's own unpublished sequel, Fuzzies and Other People, was discovered (by Piper's protegé of sorts, Mike Knerr) and published (by Ace) in 1984.  More recently, John Scalzi wrote Fuzzy Nation, an officially-authorized "reboot" of Little Fuzzy. 

Author and Piper biographer John F. Carr, who edited four collections of Piper's short stories also published by Ace in the 1980's, has authored several sequels to Piper's Paratime novel Lord Kalvan of Otherwhen and more recently has written other novels set both in Piper's Paratime and Terro-human Future History settings.  Carr has also edited The Rise of the Terran Federation, an anthology of Piper's early Terro-human Future History yarns and new, Piper-inspired stories of the same era written by others.

Source: http://www.zarthani.net