If you like to browse the bookshelves, some general call numbers to help you locate books by broad popular topics are:
Audiology
HV2349-2990.7 | The Deaf (Social Aspects)
QC221-246 | Acoustics
QM507 | Anatomy of the ear
QP460-471.2 | Physiology of the ear
RF89-285 | Diseases of the ear
RF285-320 | Audiology. Hearing disorders
TK7895.S65 | Speech recognition systems
Speech and Language Disorders
QP306 | Physiology. Voices and speech. Larynx
RC387.5 | Brain damage
RC423-429 | Speech and Language disorders
RC423 | General works
RC424 | Stuttering
RC424.7 | Articulation disorders
RC425 | Aphasia
RC428 | Study and teaching of speech therapy
RC428.5 | Speech therapy as a profession
RC429 | Augmentative and alternative communication
RF460-547 | Diseases of the throat
RJ496 | Pediatrics. Diseases of the nervous system
Linguistic Aspects
BF215-240 | Speech perception (Psychology)
P118-118.75 | Language acquisition
P215-240 | Phonology. Phonetics
Educational Aspects
LB1139.L3 | Children. Language development
LB3454 | School health services. Speech disorders. Speech therapy
LC4616-4620 | Mentally handicapped children. Language
LC4704.85-4704.87 | Learning disabled children. Language
LC4708-4710 | Dyslexic children
LC4717-4719 | Austistic children
Swallowing
RC815-815.6 | Deglutition disorders
RJ463. I54 | Pediatrics. Deglutition disorders