Does Anyone know if this series by Georgina Genry has to be read in order or are the books kinda stand alone

1       Cheyenne Captive                  

2       Cheyenne Princess                

3       Comanche Cowboy              

4       Bandit's Embrace                  

5       Nevada Nights                       

6       Cheyenne Caress         

7       Quicksilver Passion              

8       Apache Caress             

9       Sioux Slave                  

10     Half-Breed's Bride                

11     Nevada Dawn              

12     Cheyenne Splendor               

13     Song of the Warrior             

14     Warrior's Prize            

15     Cheyenne Song            

16     Apache Tears              

bump

I checked a few places and can't seem to find an "order" to be read.  I'm thinking maybe they can be read standalone.