This guide is designed to alert readers to the scope and variety of programming coming up. Listing is not meant to represent blanket endorsement. Viewers are urged to be selective. FRIDAY The Miser (PBS, 9-11 p.m.): ``Great Performances'' presents Moli`ere's classic play about greed.
SATURDAY The Nitty Gritty Dirt Band/New Grass Revival (PBS, 9-10 p.m.): ``Austin City Limits'' gives bluegrass another outing.
SUNDAY The Woman He Loved (CBS, 9-11 p.m.): (Drama previewed at right.) Dear America: Letters Home From Vietnam (HBO/pay cable, 9-10:30 p.m.; also April 12, 17, 20, 25, 30, check times): Poignant multimedia portrait of the Vietnam experience as seen through the eyes of veterans' letters home. Mario Puzo's `The Fortunate Pilgrim' (NBC, 9-11 p.m.; also Monday 8-11 p.m.): (Miniseries previewed at right.) David Copperfield (PBS, 9-10 p.m.): ``Masterpiece Theatre'' presents Part 2 of a new five-part production of Dickens's classic. The Unruly Dragon (ABC, 10-11 p.m.): Unique documentary voyage into the culture and traditions of the people who live along China's Yellow River. Martin Luther King Jr.: A Tribute by William Warfield (PBS, 10-11 p.m.): A tribute to the civil rights leader on the 20th anniversary of his assassination.
MONDAY Prehistoric Man (PBS, 8-9 p.m.): ``Discoveries Underwater'' uncovers some of the earliest human remains. Japan (PBS, 9-10 p.m.): Premi`ere of four-part in-depth look at Japan. Martin Luther King: A Life and a Legacy (PBS, 10-11:30 p.m.): A Thames TV update on whether Dr. King's dreams have been realized.
TUESDAY Poison and the Pentagon (PBS, 9-10 p.m.): ``Frontline'' investigates the Pentagon's record for cleaning up its pollution. Elizabeth Bishop: One Art (PBS, 10-11 p.m.): ``Voices and Visions'' presents the works of poet Bishop.
WEDNESDAY The Smothers Brothers Comedy Hour (CBS, 8-9 p.m.): Tom and Dick are back again in a regular spot. Fires of the Mind (PBS, 8-9 p.m.): ``The Infinite Voyage'' delves into the development of human intelligence. Journey Into Genius (PBS, 9-10 p.m.): ``American Playhouse'' celebrates the Eugene O'Neill centennial with a biographical portrait of young Eugene. Thy Kingdom Come ... Thy Will Be Done (PBS, 10-11:30 p.m.): Two companion documentaries on the Christian fundamentalist right.
THURSDAY Rumpole and the Official Secret (PBS, 9-10 p.m.): ``Mystery'' presents still another new episode with that irascible ``old darling.''
Listings are in Eastern time; other zones may vary. Please check listings for all PBS programs since local option often results in differing days and times.