DHCP on different subnets

I have a DHCP server with the following config:

authoritative;
ddns-update-style interim;
#ddnd-updates off;
ddns-domainname "mowisp.net";
ignore client-updates;

subnet 66.119.9.0 netmask 255.255.255.0 {

option routers 66.119.9.1;
option subnet-mask 255.255.255.0;
option broadcast-address 66.119.9.255;
option domain-name "mowisp.com";
option domain-name-servers 66.119.9.201,66.119.9.202;

range dynamic-bootp 66.119.9.40 66.119.9.199;
default-lease-time 7200;
max-lease-time 14400;

host Chris_Tyler {
hardware ethernet 00:09:5B:2A:A1:D3;
fixed-address 66.119.9.33;
}

host Craig_House {
hardware ethernet 00:0F:B5:6C:1D:5B;
fixed-address 66.119.9.252;
}

host Conco_Camera {
hardware ethernet 00:80:F0:33:60:C5;
fixed-address 66.119.9.2;
}

host Clever_Master {
hardware ethernet 00:30:1A:17:AB:9A;
fixed-address 66.119.9.245;
}

host Clever_Slave {
hardware ethernet 00:30:1A:17:AB:52;
fixed-address 66.119.9.246;
}

host Total-Wireless-Router {
hardware ethernet 00:E0:4C:15:27:27;
fixed-address 66.119.9.253;
}

host Greg_Lane {
hardware ethernet 00:0E:08:E0:94:F4;
fixed-address 66.119.9.170;
}

}

subnet 172.19.0.0 netmask 255.255.255.0 {
option routers 172.19.0.1;
option subnet-mask 255.255.255.0;
option broadcast-address 172.19.0.255;
option domain-name "mowisp.com";
option domain-name-servers 66.119.9.201,66.119.9.202;

range dynamic-bootp 172.19.0.2 172.19.0.254;
default-lease-time 7200;
max-lease-time 14400;
}

Problem is that it does not want to assign 172.19.0.0/24 addresses..
It will only assign addresses from the 66.119.9.0/24 pool and it does
it quite well. Question is, how do I get it to assign 172.19.0.0/24
addresses as well as 66.119.9.0/24 addresses but with the 172 being the
preferred pool?

.

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