In the last few years (2012 and before) there has been considerable correspondence amongst compilers of works' lists regarding Marie Louka. "Her" name graced many items of sheet music and without any research it was generally assumed, by myself included, that "she" was a ragtime era lady composer. Due to the efforts of the composer's grandson, Lewis J. Thomas Jr. of St. Louis, Missouri, and John McDonnell it has been determined unequivocally that Marie Louka was in fact a pseudonym .
Many thanks gentlemen!
Johann C. Schmid was a prolific composer and it is quite surprising that so little is known about him.
 
Websites:

information about Johann C. Schmid's "Marie Louka" music

Lists on works etc by John McDonnell.

Johann C. Schmid  has at least 3 item(s) at the Amazons which you can order on-line by clicking the item's order icon.

Dance of the Dewdrops By Johann C. Schmid as Marie Louka. Publisher: Johann C. Schmid Suppliers: Printed: 1905. Sheet Music. Limited Availability.

Fleeting Hours Reverie By Johann C. Schmid as Marie Louka. Publisher: Weymann & Son Suppliers: Printed: 1905. Sheet Music. Limited Availability.

A Silent Prayer Ein stilles Gebet By Johann C. Schmid. Publisher: Volkwein Bros. Suppliers: Printed: 1904. Sheet Music 8 pages. Limited Availability.

This list is arranged in chronological order and contains 31 works by Johann C. Schmid. It does not claim to be complete and represents only the number of items located. Key: Items on hold

Japanese Fire Dance (1901)  as Marie Louka	Cap and Gown March (1912)  as Marie Louka
The Rajah (1902)  as Marie Louka	Dance of the Toys (1912)  as Marie Louka
Cupid's Dart (1903)  as Marie Louka	Dancing Dolls (1912)  as Marie Louka
Karmara (1903)  as Marie Louka	Mission Bells (1912)  as Marie Louka
Daisies (1904)  Words by: Richard C. Dillmore as Marie Louka	Sunset on the Ocean (1912)  as Marie Louka
Dance of the Snowflakes (1904)  as Marie Louka	Ocean Spray (1915)  as Marie Louka
The Fadettes (1904)  as Marie Louka	Victorious Peace (1924) as Marie Louka - Piano Roll
The North American (1904)  as Marie Louka	The Arrival of Santa Claus (1925) as Marie Louka - Piano Roll
A Silent Prayer (1904)   as Marie Louka	Mother's Lullaby (1925) as Marie Louka - Piano Roll
Dance of the Dewdrops (1905)   as Marie Louka	Songs for Childhood Games (1925) as Marie Louka - Piano Roll
Fire and Flame (1905)  as Marie Louka	Damask Rose (1939)  as Marie Louka
Fleeting Hours (1905)   as Marie Louka	Dance of the Fireflies (1939)  as Marie Louka
The Hour of Prayer (1905)  as Marie Louka	Dancing Shadows (1939)  as Marie Louka
Birds and Breezes (1906)  as Marie Louka	Thoughts at Sunset (1939)  as Marie Louka
The Captain General (1906)  as Marie Louka	Flowers From the Dust (1941)  Words by: Dorothy Elder as Marie Louka
Phasma (1907)  as Marie Louka