Yes, you can qualify for USA-Swimming nationals, provided your swim meets USA-S documentation requirements and is entered into USA-S Swimming Tracking and Recognition System (STARS) data base. The requirements and procedures can be found on the USA-Swimming.org web site.
As for 50 and 100 times - are you looking for SCM, LCM, SCY, male, female? These time standards are also available at usa-swimming.org.
