They walked through Darke County woods, through nearby fields on Saturday and Sunday. On Monday, the search took them along Interstate 75.
"We've searched by horseback, by helicopter, with search dogs," said Susan Hibbitts, Topp's aunt and a teacher in Dayton schools who posted fliers along the highway Monday.
Topp, 19, left home at 8 a.m. Saturday for a regular 4-mile jog. A neighbor last saw her walking about 10 minutes after Topp had left her home, 13199 U.S. 127.
It wasn't until hours later that her family became concerned.
"We weren't worried for awhile, we figured she stopped to look at the mini-farm we have up there and look at the animals," Topp's mother, Mary Lou, said Monday.
Lynn was well overdue to leave for her 3 p.m. shift at the Brethren's Home senior care center, Mary Lou Topp said. Shortly after 2 p.m., the Topps called the sheriff's department.
Her Walkman-style radio - found in a ditch a mile from her home - was the clue that turned the disappearance into a possible abduction investigation.
The radio worked. The headphones were nowhere to be found.
"If a crime has been committed, we feel that is where it happened," said Darke County Sheriff Toby Spencer.
Investigators Monday tried to get in touch with Topp's friends, former boyfriends and anyone she had been seen with recently, Spencer said. Authorities have learned Topp had no record of any domestic fights, Spencer said, and had no steady boyfriend.
Topp was studying to teach severely behaviorally handicapped children as a freshman at Wright State University's Lake Campus near Celina.
"This is just so out of character for her to be missing. She's very responsible," Hibbitts said. "That's why you feel completely lost. You don't know what to do."
BILL REINKE/DAYTON DAILY NEWS
(2) Lynn Topp, 19, is 5 feet 4 inches tall, weighs 150 pounds and has curly brown hair and brown eyes. She was last seen wearing a maroon sweatshirt with "Arizona" printed on the front. Her family is offering a $5,000 reward to anyone who has information that leads to finding her. Anyone with information about Topp's case is asked to call the Darke County sheriff's department at 937-548-2020.
MAP: Lynn Topp's home/Jogging route
Where radio was found
Darke County
DAYTON DAILY NEWS
* CONTACT Jim Bebbington at 335-3997; or at
jim_bebbington@coxohio.com
NOTE:
ELECTRONIC FILE OF MAP NOT AVAILABLE
SEE MICROFILM EDITION